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For a Binomial distribution $X \sim B(n, p)$, the **mean** (expected value) is:
A$np$
B$npq$
C$\sqrt{npq}$
D$p/n$
Answer & Solution
Correct answer: A. $np$
Mean $E(X) = np$. For a single Bernoulli trial $E = p$; by linearity, $n$ independent trials give $E = np$.
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