Question: 30. Let X be a binomial random variable with the parameters (n, p). Prove that n E(X)=2 x=1 n p (1 - p)-np - np

30. Let X be a binomial random variable with the parameters (n, p). Prove that

n E(X)=2 x=1 n p (1 - p)-np - np + np.

n E(X)=2 x=1 n p (1 - p)-np - np + np.

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