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If ∑(xi - a) = n and ∑(xi - a)^2 = na for i ∈ [1,n], (n,a > 1) then the standard deviation of n observations x1, x2 ,....,xn is

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If ∑(xi - a) = n and ∑(xi - a)2 = na for i ∈ [1,n], (n,a > 1) then the standard deviation of n observations x1, x2 ,....,xn is 

(1) n√(a - 1)

(2) √(a - 1)

(3) a – 1 

(4) √(n(a - 1))

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1 Answer

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Answer is (2) √(a - 1)

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