Calculate mean by short-cut method:- [7]
X 20 21 22 23 24 25
F 1 2 4 5 15 23
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Answer:
Families
Monthly income
(X)
Deviation from the Assumed average
(d = X − A) (A = 75)
1
2
3
4
5
6
7
8 70
10
500
75 (A)
13
250
8
42 −5
−65
425
0
−62
175
−67
−33
(N) = 8
(ΣX)=968 Σd = −232 + 600 = 368
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