20. Find the mean of the following frequency distribution using step-
deviation method:
Class:-
0-10
10-20
20-30
30-40
40-50
Frequency:-
7
10
15
8
10
Answers
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interval X No. of employees
F d=
i
X−A
Fd
4-8 6 5 -1 -5
8-12 10=A 10 0 0
12-16 14 15 1 15
16-20 18 20 2 40
ΣF=50 ΣFd=50
Mean = A+
Σf
Σfd
×i=10+(
50
50
×4)=10+4=14
D) 14
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