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Question

The variance of first n natural numbers, is

A
n+12
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B
n2+112
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C
n216
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D
n2112
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Solution

The correct option is D n2112
First n natural number are, x=1,2,3,.............n
So mean of first n natural number is ¯x=xin=n+12
variance, σ2=x2in(¯x)2
=16n(n+1)(2n+1)n(n+12)2=112(n+1)(n1)=n2112

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