Example 2.2.3 : Binomial mean If X has a binomial distribution, its pmf is given by n fx ( x ) = P ( X
Example 2.2.3 : Binomial mean If X has a binomial distribution, its pmf is given by n fx ( x ) = P ( X = x)= p (1 -p)" x, x = 0,1, ..., n Then, n E(X) = n p* ( 1 - p ) 7 - x ( Try) X = = np X=0
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