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

1.

If variance (σ) = √(∑fd2/k - (∑fd/30)2) then value of k is –(A) 10(B) 20(C) 30(D) 60

Answer»

Answer is (C) 30

Formula (σ) = √(∑fd²/k - (∑fd/30)²)

k = 30

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