Question

The mean of the following frequency distribution is 52:
Class
10-20
20-30
30-40
40-50
50 - 60
60-70
70-80
Frequency
5
3
4
f
2
6
13
Find the missing frequency f.​

Answer 1

Mean = Sum of all observations /

No. of observations

52 = 5+3+4+f+2+6+13 / 8

52 = 33+f / 8

52 X 8 = 33+f

416 = 33+f

f = 416 - 33

f = 383

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