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Q.

The variance of the following continuous frequency distribution.

Class Inteval0-1010-2020-3030-40
Frequeny2341

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a

201

b

62

c

69

d

84

answer is D.

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Detailed Solution

C.Ifixifi xi(x-xi)2fi (xi-x)2
0-102510196392
10-20315451648
20-3042510036144
30-4013535256256
N=∑ fi=10∑ fi xi=190∑ fi (xi-x)2=840

1x=∑ fi xiN=19010=19

Variance σ2=1N ∑ fi (xi-x)2

                     =110 (840)=84

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