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If barxis at mean of n values of x, then...

If `barx`is at mean of n values of x, then `overset(n)underset(i=1)Sigma(x_(i)- barx)=0` and if a has value other than `barx " then " overset(n)underset(i=1)Sigma(x_(i)- barx)^(2) " is less than " Sigma(x_(i)-a)^(2)`

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