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Question

The S.D.is not less than the mean deviation. If this is true enter 1, else enter 0.

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Solution

We take 1Nifi(xi¯x)2{1Nfi|xi¯x|}2
Put |xi¯x|=zi
1Nifiz2i¯z2{1Nifizi}2 to 1Nfiz2i{1Nizi}2
σ2z0 which is always true.

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