The marks scored by 24 students is given below
6, 7, 8, 9, 6, 7, 8, 7, 6, 9, 7, 8
6, 7, 9, 6, 8, 7, 6, 7, 8, 6, 7, 9
Prepare a frequency table for this information and also find the mean of the marks
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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
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