waecE-LEARNING
General Mathematics Paper 2,Nov/Dec. 2012  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 Main
General Comments
Weakness/Remedies
Strengths

Question 12

  1. The ages (in years) of men selected from a community are as follows:

                            44   28   58   50   93   35   34   52   57   61
                            40   63   90   67   64   56   51   82   73   43
                            73   73   44   71   95   52   71   25   35   79
                            28   40   72   88   82   63   53   48   98   65
                            63   44   73   70   68   46   54   62   41   70

    (a)        Prepare a group frequency distribution table with the intervals 20 – 29, 30 – 39, ...
    (b)        Calculate the mean deviation of the distribution.

_____________________________________________________________________________________________________
Observation

The Chief Examiner reported that this question was very popular among the candidates and their performance was commended.  According to the report, their responses showed that they understood this aspect of the syllabus. 

Candidates were reported to have obtained the following table correctly. 

Class
Interval

Class
Mark

Tally

Frequency
(f)

fx

|x-|

f| x-

20 - 29

24.5

׀׀׀

3

73.5

36

108

30 - 39

34.5

׀׀׀

3

103.5

26

78

40 – 49

44.5

׀׀׀׀  ׀׀׀׀

9

400.5

16

144

50 – 59

54.5

׀׀׀׀  ׀׀׀׀

9

490.5

6

54

60 – 69

64.5

׀׀׀׀  ׀׀׀׀

9

580.5

4

36

70 – 79

74.5

׀׀׀׀  ׀׀׀׀

10

745.0

14

140

80 – 89

84.5

׀׀׀

3

253.5

24

72

90 – 99

94.5

׀׀׀׀

4

378.0

34

136

 

 

 

Σf = 50

Σfx = 3025

 

Σf |x-|=
768

Powered by Sidmach Technologies(Nigeria) Limited .
Copyright © 2015 The West African Examinations Council. All rights reserved.