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

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