# Mathematics Grade 12 Paper 3 NSC November 2013 Memo

> Grade 12 Mathematics Paper 3 memorandum from the NSC November Exam 2013, 14 pages. Read online or download the free PDF.

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- Updated: 2026-09-27
- Subject: Mathematics
- Grade: Grade 12
- Document type: Memorandum
- Year: 2013
- Exam period: NSC November Exam
- Paper: 3
- Curriculum: CAPS
- Pages: 14

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Mathematics · Grade 12 · NSC November Exam · 2013. Memorandum, 14 pages. Read online or download the PDF.

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### Page 1

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                                             NATIONAL
                                        SENIOR CERTIFICATE
                                            NASIONALE
                                        SENIOR SERTIFIKAAT

                                          GRADE/GRAAD 12

                                 MATHEMATICS P3/WISKUNDE V3

                                            NOVEMBER 2013

                                            MEMORANDUM

MARKS/PUNTE: 100

                             This memorandum consists of 14 pages.
                            Hierdie memorandum bestaan uit 14 bladsye.

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Mathematics P3/Wiskunde V3                                                          2                               DBE/November 2013
                                                                          NSC/NSS – Memorandum

NOTE:
• If a candidate answered a question TWICE, mark only the first attempt.
• If a candidate crossed out an attempt of a question and did not redo the question, mark the
  crossed-out question.
• Consistent accuracy applies in ALL aspects of the marking memorandum.

LET WEL:
• As 'n kandidaat 'n vraag TWEE keer beantwoord het, merk slegs die eerste poging.
• As 'n kandidaat 'n antwoord deurgehaal en nie oorgedoen het nie, merk die deurgehaalde
   antwoord.
• Volgehoue akkuraatheid is DEURGAANS in ALLE aspekte van die memorandum van toepassing.

QUESTION/VRAAG 1
 Calories                                                    270       310      340      360     440      450         580         620
 Total fat (in grams)                                        14         12       25       21      28       24          32          43

1.1
                                                                   Scatter Plot showing number of calories versus total fat                  (in
                                                                                                 sandwiches
                                                        45

                                                        40

                                                        35

               Total Fat (in grams) /Totale vetinhoud
                                                        30

                                                        25

                              (in gram)
                                                        20

                                                        15

                                                        10

                                                                                                    all 8 points plotted correctly
                NOTE:
                • The English and Afrikaans diagrams are                                           2 marks for 5 – 7 points plotted
                  different in size                                                                correctly
                • The point (300 ; 34) is from 1.4. Do not
                  penalise for this point in question 1.1.                                         1 mark for 2 – 4 points plotted
                • The learner may have other points due to                                         correctly
                  trying to draw the least squares
                  regression line                                                                  No marks for 1 point or less plotted
                                                                                                   correctly.                           (3)
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Mathematics P3/Wiskunde V3                        3                                   DBE/November 2013
                                        NSC/NSS – Memorandum

1.2 a = – 5,62 (– 5,62181859...)                                      a or b
                                           NOTE:
    b = 0,07 (0,072396008...)                                         b or a
                                           Penalty 1 for rounding
    yˆ = −5,62 + 0,07 x                                               equation
                                           in question 1.2.
                                                                                                              (4)
1.3 Drawn on the scatter plot                                         graph passing close to (350 ; 19) /
                                                                       (300 ; 16) / (650 ; 40)
                                                                      gradient (graph close to (450 ; 26))
                                                                                                           (2)
1.4 The sandwich from Pinky’s restaurant has 30 grams of fat.
    In terms of the model, the sandwich with 16 grams of total        comparison with model (literal or
    fat should provide 300 calories. This suggests that the            graphical (i.e. plotting the point))
    sandwich from Pinky’s restaurant is far removed from
    expected model and is therefore an outlier.                       outlier / explain this concept
                                                                                                              (2)
      Die toebroodjie van Pinky se restaurant het ‘n vetinhoud
      van 30 gram. In terme van die model, sal ‘n toebroodjie van     vergelyking met model
      16 gram, 300 kalorieë verskaf. Dit veronderstel dat die
      toebroodjie van Pinky se restaurant ver van die verwagte        uitskieter
      model verwyder is en is dus ‘n uitskieter.                                                              (2)

1.5   r = 0,92        (0,92099548...)                                 answer
                                                                                                              (2)
1.6 There is a very strong, positive correlation between the          strong / reference to correlation
    number of calories and the total fat in the sandwiches. A         positive / increasing / explain the
    sandwich with higher number of calories will have a higher         concept of increasing
    total fat content.
                                                                                                              (2)
      Daar is ‘n baie sterk positiewe korrelasie tussen die aantal
      kalorieë en die totale vetinhoud in die toebroodjies. ‘n
      Toebroodjie met ‘n hoë aantal kalorieë sal ‘n hoër totale
      vetinhoud hê.
                                                                                                             [15]

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Mathematics P3/Wiskunde V3                        4                                   DBE/November 2013
                                        NSC/NSS – Memorandum

QUESTION/VRAAG 2

2.1       Random Sampling Method                                            answer
                                                                                                            (1)
          Ewekansige Steekproef Metode / Willekeurig / Onwillekeurig/
          Lukraak
2.2       Although the sample is selected randomly, there exists a
          chance that this could be a homogenous sample.                    homogenous sample /
          For example the sample could contain many learners from one        the sample will be biased
          grade and few from other grades.                                   towards one characteristic
          The sample could contain many more learners of a particular                                 (1)
          gender and few from the other.

          Al is die steekproef ewekansig gedoen bestaan die kans wel
          dat die steekproef homogeen kan wees. Ter voorbeeld, die
          steekproef kan baie leerders van een graad insluit en min van     homogene steekproef
          ander grade.
          Die steekproef kan ook meer leerders van ‘n bepaalde geslag                                       (1)
          insluit en min van die ander geslag.
2.3       The sampling should have equal representation across various      equal representation of
          criteria. In this case the criteria will possibly be grade and     grade
          gender. There should possibly be a selection of 8 boys and 8      equal representation of
          girls randomly from each grade for the sample.                     gender

          Gelyke verteenwoordiging van verskillende kategorieë moet in        any explanation that
          die steekproef teenwoordig wees. In die geval sal die               indicates representing the
          kategorieë graad en geslag wees. Daar behoort moontlik 8            school for equally
          seuns en 8 meisies van elke graad ewekansig gekies te word          Ideas to consider:
          vir die steekproef.                                                 gender; race; grade
                                                                                                            (2)

                                                                                                            [4]

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Mathematics P3/Wiskunde V3                         5                                     DBE/November 2013
                                         NSC/NSS – Memorandum

QUESTION/VRAAG 3

3.1       Disagree. The events A and B have an intersection and are            disagree
          therefore not mutually exclusive.                                    intersection between events
          P(A and B) ≠ 0                                                        exist
                                                                                                        (2)
          Verskil. Die gebeurtenisse A en B sny mekaar en is daarom
          nie onderling uitsluitend nie.
          P(A en B) ≠ 0

          OR
          Disagree                                                             disagree
          P(A) + P(B) + P(C) = 1,07
          Since the sum of the probabilities of the events is greater than     intersection between events
          1, these events must have an intersection. Hence A and B are          exist
          not mutually exclusive events.                                                                (2)
          Verskil
          P(A) + P(B) + P(C) = 1,07
          Siende dat die som van die waarskynlikhede van al die
          gebeurtenisse groter as 1 is, moet daar ‘n snyding wees.
          Vervolgens sal A en B nie onderling uitsluitend wees nie.

3.2.1     P(B or C) = P(B) + P(C)                                              substitution into correct
                    = 0,3 + 0,32               NOTE:                          formula
                    = 0,62                     Answer only: full marks         answer
          OR                                                                                                   (2)

                         A                                C
                                           B
                                                              0,32
                        0,315
                                 0,135
                                         0,165

          P(A and B) = P(A).P(B)                                               substitution into correct
                     = 0,45 × 0,3                                             formula
                     = 0,135                                                   answer
          P(B or C) = 0,135 + 0,165 + 0,32                                                                     (2)
                   = 0,62
3.2.2     P(A and B) = P(A).P(B)               NOTE:
                     = 0,45 × 0,3              Answer only: 1/2
                     = 0,135                   marks                           0,135
          P(A or B) = P(A) + P(B) – P(A and B)
                    = 0,45 + 0,3 – 0,135
                    = 0,615                                                    answer
                    = 0,62                                                                                     (2)
                                                                                                               [6]

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Mathematics P3/Wiskunde V3                        6                                      DBE/November 2013
                                        NSC/NSS – Memorandum

QUESTION/VRAAG 4
4.1       The word “EQUATIONS” has 9 letters
          Number of different 5 letter codes                                   multiplication rule in five
          = 9×8× 7× 6×5                                                         “slots”
          = 15120                                                              answer
                                                                                                           (2)
          OR
          Number of different 5 letter codes
            9!                                                                 multiplication rule in five
          =
            4!                              NOTE:                               “slots”
          = 15120                           Answer only: 2/2 marks             answer
                                                                                                           (2)
          ACCEPT:
          Number of different 5 letter codes (this is with repetition)
          = 95
          = 59049
4.2       4 consonants
          5 vowels

          Number of different codes       OR Number of different codes        5
          = 5 × 5 × 4 × 3 × 2 ×1             = 5 × 5!                          5!
          = 600                              = 600                             answer
                                                                                                               (3)
                                                                                                               [5]
QUESTION/VRAAG 5
5.1       The heights / frequency of the histogram for the interval            heights / frequency
          500 ≤ x < 700 are incorrect.                                        incorrect
          Die hoogtes / frekwensies van die histogram vir die wydte                                            (2)
          500 ≤ x < 700 is nie korrek nie.
          OR                                                                  width not taken into
          The histogram has not taken into account the width of the             account
          classes. The first class is double the width of the other classes.
          The area of the rectangles for the class 500 ≤ x < 700 is double                                     (2)
          what it should be.
          Die histogram het nie die wydte van die klasse in ag geneem
          nie. Die eerste klas is dubbel die wydte van die ander klasse.
          Die oppervlakte van die reghoeke vir die klas 500 ≤ x < 700, is
          dubbel wat dit behoort te wees.
          OR
          Area of each rectangle is not in the same ratio as the               area of rectangle not in
          frequencies.                                                           same ratio as frequencies
          Die area van elke reghoek is nie in dieselfde verhouding as                                     (2)
          die frekwensies nie.
5.2       The interval 500 ≤ x < 700 should have a frequency of 5.             frequency should be 5
                                                                               keep interval the same
          Die frekwensie behoort 5 vir die klas 500 ≤ x < 700 te wees.                                         (2)
                                                                                                               [4]
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Mathematics P3/Wiskunde V3                              7                            DBE/November 2013
                                              NSC/NSS – Memorandum

QUESTION/VRAAG 6

6.1

                    A/M                                    N/W
                                                    
                                       100          470
                          670

                                       40      
                                80              70

                                         x
                                                     P/O
                                                                                                            (6)
6.2       x + 80 + 40 + 70 + 470 + 100 + 670 = 2140                        sum of values in Venn
                                    x + 1430 = 2140                         diagram = 2140
                                          x = 710                          answer for x (must not be
          Number said lack of parental support                              negative)
          = 710 + 80 + 40 + 70
          = 900                                                            answer
                                                                                                            (3)
6.3       P(exactly 2 problems)
            80 + 100 + 70                                                  80 + 100 + 70 = 250
          =
                2140                                                       2140
             250
          =
            2140
             25
          =
            214                                                            answer
          = 0,12         (0,1168224299...)                                                                  (3)
                                                                                                           [12]

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Mathematics P3/Wiskunde V3                              8                                            DBE/November 2013
                                              NSC/NSS – Memorandum

QUESTION/VRAAG 7

                                                    34%        34%
                                        14%                               14%
                             2%                                                      2%

                        1         4            7          10         13         16        19
7.1.1     16 = 10 + 2(3)                                                                    2 std deviations from mean.
          P(More than 16 point) = 2%                                                        2%
                                                                                                                     (2)
7.1.2      84                                      NOTE:                                    84%
              × 200 = 168 learners                                                          answer
          100                                      If 16% is used: max 1 mark
                                                                                                                     (2)
7.2       Mathematics test x + σ = 55 + 15
                                   = 70                                                     x + σ = 70
          English test     x + σ = 55 + (7,5)
                                 = 62,5                                                     x + σ = 62,5
                           x + 2σ = 55 + 2(7,5)
                                  = 70
          Matilda scored better relative to her classmates in the English                   answer
          test as she scored between the 1st and the 2nd deviation from                                                    (3)
          the mean.
          Matilda het beter as die res van haar klasmaats in die Engelse
          toets gevaar aangesien haar punt tussen die 1ste en die 2de
          afwyking van die gemiddeld was.

          OR

          A mark of 67% in Maths lies within 1 standard deviation to
          the right of the mean. Hence it is approximately at the 76th                      76th percentile
          percentile of distribution of the Maths marks.
          A mark of 67% in English lies between 1 and 2 standard
          deviations to the right of the mean. Hence it is approximately                    95th percentile
          at the 95th percentile of distribution of the English marks.
          Matilda scored better relative to her classmates in the English
          test as she has outperformed more learners in English than in                     answer
          Maths.                                                                                                           (3)

          ‘n Punt van 67% in Wiskunde lê binne 1 standaardafwyking
          aan die regterkant van die gemiddeld. Vervolgens is dit
          ongeveer by die 76 ste persentiel van die verspreiding van die
          Wisk punte.’n Punt van 67% in Engels lê tussen die 1ste en
          2de standaardafwyking regs van die gemiddeld. Vervolgens is
          die Engelse punt ongeveer by die 95 ste persentiel van die
          verspreiding van die Engelse punte. Matilda het relatief tot
          haar klasmaats beter in die Engelse toets gevaar. Sy het beter
          gevaar as meer van die leerders in Engels as in Wiskunde.
                                                                                                                           [7]

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Mathematics P3/Wiskunde V3                                 9                                  DBE/November 2013
                                                 NSC/NSS – Memorandum

QUESTION/VRAAG 8
8.1      T1 = −5
         T2 = −5 + 3(2 ) − 4 = −3                                                      T2 = −3
         T3 = −3 + 3(3) − 4 = 2                                                        T3 = 2
         T4 = 2 + 3(4 ) − 4 = 10                                                       T4 = 10
                                                                                                                          (3)
8.2      T30 = T1 + S 29 of the linear pattern                                         T1 + S 29 of the linear pattern
                     29                                                               a=2
              = −5 +    [2(2) + 28(3)]                                                d=3
                      2
              = −5 + 1276
              = 1271                                                                   answer
                                                                                                                          (4)
         OR
                             2a = 3
                                     3                                                           3
                               a=                                                      a=
                                     2                                                           2
                    3
                   3  + b = 2
                    2
                                         5                                                           5
                               b=−                                                     b=−
                                         2                                                           2
         3  5
           +  −  + c = −5
         2  2
                       c = −4                                                          c = −4
                           3      5
                     Tn = n 2 − n − 4
                           2      2
                           3        5
                     T30 = (30) − (30) − 4
                                2

                           2        2
                         = 1271                                                        answer
         OR                                                                                                               (4)
         By expanding the formula:

         − 5 ; – 3 ; 2 ; 10 ; 21 ; 35 ; 52 ; 72 ; 95 ; 121 ; 150 ; 182 ; 217 ;
         255 ; 296 ; 340 ; 387 ; 437 ; 490 ; 546 ; 605 ; 667 ; 732 ; 800 ; 871;
         945 ; 1 022 ; 1 102 ; 1 185 ; 1 271
                                                                                       expansion
                   th
         The 30 term = 1 271                                 NOTE:
                                                                                       answer
                                                             Answer only: 4 marks                                         (4)
                                                                                                                          [7]

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Mathematics P3/Wiskunde V3                         10                                  DBE/November 2013
                                         NSC/NSS – Memorandum

QUESTION/VRAAG 9

                       A           2x           B       x    C

                                          F

                                                    E

                                                                   D

9.1      AF : FE
         =2:1              (Prop Th; FB || EC)                                    answer
                           (Eweredigheid St; FB || EC)                            reason
                                                                                                             (2)
9.2      AF 2
            =
         FE 1
              AF 8
         FE =    = = 4 cm                                                         FE = 4 cm
               2  2
                                                                                  AE = 12 cm
         AE = 12 cm

          ED 1                                                                       ED 1
            =              (BE || DC; Prop Th) / (BE || DC; Eweredigheid St)          =
          AE 2                                                                       AE 2
          ED 1
            =
          12 2
                                                                                  answer
         ED = 6 cm                                                                                           (4)
                                                                                                             [6]

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Mathematics P3/Wiskunde V3                                  11                                       DBE/November 2013
                                                  NSC/NSS – Memorandum

QUESTION/VRAAG 10                                                                B
                                                    F                    1
                                                                                 3
                                                                             2

                                    G
                                                                         •O
                                                                                        C
                                                    4          56°
                                              5
                                                         3
                                              E          2
                                                        1
                                                             32°
                                                                     D

                                                                     H
10.1     Ê 2 = 90° – 56°               (∠s in a semi circle)                                   Ê 2 = 34°
         Ê 2 = 34°                     (∠e in ‘n halwe sirkel)                                 ∠s in a semi circle
                                                                                                                           (2)
10.2     CÊH = Ê1 + Ê 2 = 66°                                                                CÊH = 66°
         ∴ EB̂C = B̂2 + B̂3 = 66°             (tan ch th)                                       EB̂C = 66°
                                (raaklyn koord)                                                tan ch th
         OR                                                                                                                (3)

         B̂ 2 = 32°                     (tan ch th)                                             tan ch th
                                        (raaklyn koord)
         B̂ 3 = 34°                     (∠s in the same segment)                                B̂ 3 = 34°
                                        (∠e in selfde seg)
         EB̂C = 66°                                                                             answer
                                                                                                                           (3)

10.3     Ê1 + Ê 2 + Ê 3 = 122°
                                                                                                F̂ = 122°
         F̂ = 122°         (tan ch th) / (raaklyn koord)
                                                                                                reason
         OR

         Ĉ = 58°          (sum of int ∠s of ∆) / (som van binne∠e ∆)                           Ĉ = 58°
         F̂ = 122°         (opp ∠s cyclic quad) / (oorst ∠ koordevierhoek)                      ∠ sum ∆
                                                                                                F̂ = 122°
                                                                                                opp ∠s cyclic quad
         OR
                                                                                                D̂ = 58°
         D̂ = 58°          (sum of int ∠s of ∆) / (som van binne∠e ∆)
                                                                                                ∠ sum ∆
                                                                                                F̂ = 122°
         F̂ = 122°         (opp ∠s cyclic quad) / (oorst ∠ koordevierhoek)
                                                                                                opp ∠s cyclic quad
                                                                                                                           (4)
                                                                                                                           [9]
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Mathematics P3/Wiskunde V3                        12                                     DBE/November 2013
                                        NSC/NSS – Memorandum

QUESTION/VRAAG 11

                               O

                  A            B          C

         Construct radii OA and OC.                                                 construction
         In ∆OAB and ∆OCB
             i. OB is common                                                        OB common
             ii. OA = OC       (radii)                                              radii
             iii. OB̂A = OB̂C = 90° (given)                                         OB̂A = OB̂C = 90°
         ∆OAB ≡ ∆OCB           (90°HS)                                              90°HS
         AB = BC               (≡ ∆s)

         OR
         Construct radii OA and OC.                                                 construction
         In ∆OAB and ∆OCB
             i. OB is common            OR OA = OC             (radii)              OB common /
             ii. Â = Ĉ (∠s opp = radii)                                            OA = OC
                                                                                    ∠s opp = radii
             iii. OB̂A = OB̂C = 90° (given)
         ∆OAB ≡ ∆OCB            (SAA)                                               OB̂A = OB̂C = 90°
                                                                                    SAA
         AB = BC                (≡ ∆s)

         OR
                                                                                    construction
         Construct radii OA and OC.
         OB̂A = OB̂C = 90° (given)
         OA2 = OB2 + AB2      (Pythagoras)                                          OA2 = OB2 + AB2
         OC2 = OB2 + BC2      (Pythagoras)                                          OC2 = OB2 + BC2
         OC = OA              (radii)                                               OA = OC / radii
         OB is common
         AB2 = BC2                                                                  AB2 = BC2
         AB = BC
                                                                                                               [5]

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Mathematics P3/Wiskunde V3                            13                                              DBE/November 2013
                                            NSC/NSS – Memorandum

QUESTION/VRAAG 12

                                                                     K

                                                                 1 2 3
                                                                                 x
                                                                         x
                                                                                         1   E
                                                                                     2       2
                                                                                 1
                                                                                     O3
                                                                             4

                                                                     x                                      T
                                                                 2
                                                                         3
                                                 x           1
                                             1           x
                                                     2           Y

                                        W

12.1     K̂ 3 = x        (tan ch th)                                                              K̂ 3 = x
                         (raaklyn koord)                                                          tan ch th
         Ŷ2 = x         (∠s in same seg)                                                         Ŷ2 = x
                         (∠e in selfde seg)                                                       ∠s in same seg
         K̂ 2 = x        (∠s opp = radii) / (= chs subt = ∠s)                                     K̂ 2 = x
                         (∠e oork = radiusse) / (= koorde = ∠e)                                   reason
          Ŵ2 = x        (∠s in same seg) / (= chs subt = ∠s)                                     Ŵ2 = x
                         (∠e in selfde seg) / (= koorde = ∠e)                                     reason

                                                                                                                           (8)
12.2     Ô1 + Ô 4 = 180° − 2 x (sum of int ∠’s of ∆) / (opp∠ cyclic quad)  Ô1 + Ô 4 = 180° − 2 x
                             (som van binne∠e ∆) / (oorst ∠ koordevierhoek)  reason
         T̂ = 90° − x (∠ at circ cent = 2∠ at circumference)                 reason
                                                                                                                           (3)

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Mathematics P3/Wiskunde V3                          14                              DBE/November 2013
                                          NSC/NSS – Memorandum

12.3     Ê 2 = 90°        (sum of int ∠’s of ∆) / (som van binne∠e ∆)         Ê 2 = 90°
         KE = ET           (⊥ from centre to chord bisects chord)              sum of int ∠’s of ∆
                           (⊥ van middelpunt tot koord halveer koord)          ⊥ from centre to chord
                                                                                 bisects chord
         OR                                                                                          (3)

         K̂1 + K̂ 2 + K̂ 3 = 90° − x (sum of int ∠’s of ∆)                     K̂1 + K̂ 2 + K̂ 3 = 90° − x
         In ∆KWE and ∆TEW                                                      sum of int ∠’s of ∆
         1. K̂1 + K̂ 2 + K̂ 3 = T̂ = 90° − x (proven above)
         2. Ŵ1 = Ŵ2 = x        (Proven in 12.1)
         3. WE is common
         ∴ ∆KWE ≡ ∆TEW (∠∠S)
                                                                               ∆KWE ≡ ∆TEW
                   KE = ET                                                                               (3)

12.4     In ∆KOE and ∆WTE                                                      ∆KOE and ∆WTE
             i. K̂ 3 = Ŵ2 = x             (proven)                            K̂ 3 = Ŵ2 = x
               ii. Ê 2 = Ê 1 = 90° (∠s on str line / sum of int ∠’s of ∆)    Ê 2 = Ê 1 = 90°
                                    (∠e op reguit lyn / som van binne∠e ∆)
           iii. Ô 2 = T̂ = 90° − x    (3rd ∠ of ∆)                            Ô 2 = T̂ = 90° − x
         ∆KOE ||| ∆WTE (∠∠∠)

         KE OE                                                                    KE OE
             =      (||| ∆s)                                                       =
         WE TE                                                                    WE TE
          KE = TE   (proven)
         KE.TE = OE.WE                                                         KE = TE
         KE 2 = OE.WE
                                                                                                         (6)
         OR
                                                                               ∆KOE and ∆WTE
         In ∆KOE and ∆KWE
                                                                               K̂ 3 = Ŵ1 = x
         i.    K̂ 3 = Ŵ1 = x              (proven)
                                                                               Ê1 is common
         ii.       Ê1 is common
         iii.  Ô 2 = K̂1 + K̂ 2 + K̂ 3    (3rd ∠ of ∆)                        ∠∠∠
         ∆KOE ||| ∆WKE (∠∠∠)

         KE OE                                                                     KE OE
              =      (||| ∆s)                                                      =
         WE KE                                                                     WE KE
         KE 2 = OE.WE

                                                                                                         (6)
                                                                                                        [20]

                                                                              TOTAL/TOTAAL: 100

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