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Question

The sum of the squares of deviation of 10 observations from their mean 50 is 250, then coefficient of variation is

A
10%
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B
40%
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C
50%
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D
none of these
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Solution

The correct option is A 10%
Given, (x¯x)2=250,n=10,¯x=50
Thus standard deviation =(x¯x)2n=25=5
Coefficient of variation =σ¯x×100=550×100 % =10%

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