Question

The marks of students in a class are 67,
87, 67, 36, 38, 58, 90, 67, 58, 68, 46, 36,
29, 37, 47, 64, 35, 83, 85, 29, 46
a) Find the range of data.
b) Find the mean, median and mode.


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Answer 1

Answer:

Class Interval

Frequency

10-20

20-30

30-40

40-50

50-60

60-70

 

10

12

7

7

8

3

 

(i) For Cumulative Frequency 30−40 frequency is 7

(ii) Size is 11

Mid point for cumulative frequency 30−40 is 35.

(iii) Range =70−10=60

Answer 2

Answer:

Range = Highest Value - Lowest Value

Range = 90 - 29 = 61

Mean = 53

Median = 46

Mode = 67 , 36 , 58 , 29

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