Question

The mean of the following frequency distribution of and the sum of all frequencies is Compute the sum of missing frequencies and 
Class0 - 2020 - 4040 - 6060 - 8080 - 100100 - 120
Frequency 

Medium
Solution
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Correct option is A)

Let A = 30, h = 20
Class
0 - 20105-1-5
20 - 403000
40 - 605010+110
60 - 8070+2
80 - 100907+321
100 - 1201108+432
Given .........(i)



Now 
So the missing frequencies are 

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