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# 數學問題一問,thx

show that:

Var(x)=[1/(n+1)]*sum of (x^2) - [n/(n-1)]*X^2 (X is mean)

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- AndrewLv 61 decade agoFavorite Answer
First, you have a typo in your question, the correct question should be:

Var(x)=[1/(n-1)]*sum of (x^2) - [n/(n-1)]*X^2 (X is mean)

Notice the minus sign above, here below is the proof:

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