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Question
If X ~ B (n, p) and E(X) = 12, Var(X) = 4, then the value of n is _______
(A) 3
(B) 48
(C) 18
(D) 36
Solution
E(X) = np and Var (X) = npq
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Is there an error in this question or solution?
If X ~ B (n, p) and E(X) = 12, Var(X) = 4, then the value of n is _______
(A) 3
(B) 48
(C) 18
(D) 36
E(X) = np and Var (X) = npq