dfrac (1)(n-1)sum _(i=1)^n(({X)_(i)-overline (X))}^2 .-|||-n-|||-C. sqrt (dfrac {1)(n)sum _(i=1)^n(({X)_(i)-overline (X))}^2} . D. sqrt (dfrac {1)(n-1)}sum _(i=1)^n(({X)_(i)-overline (X))}^2

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