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If variance (σ) = √(∑fd^2/k - (∑fd/30)^2) then value of k is – (A) 10

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If variance (σ) = √(∑fd2/k - (∑fd/30)2) then value of k is –

(A) 10

(B) 20

(C) 30

(D) 60

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Answer is (C) 30

Formula (σ) = √(∑fd2/k - (∑fd/30)2)

k = 30

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