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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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Knowledge Check

  • overset(3)underset(n=1)Sigma tan^(-1) 1/n =

    A
    0
    B
    `pi//2`
    C
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    D
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    A
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    B
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    D
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  • overset(2n)underset(r=1)Sigma sin^(-1) x_r=npi " then " overset(2n)underset(r=1)Sigma x_i=

    A
    n
    B
    `2n`
    C
    `(n(n+1))/2`
    D
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