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If $X \sim B(10, 0.4)$, then $E(X)$ and $\text{Var}(X)$ are respectively:
A4 and 2.4
B4 and 4
C0.4 and 0.24
D10 and 4
Answer & Solution
Correct answer: A. 4 and 2.4
$E(X) = np = 10 \times 0.4 = 4$. $\text{Var}(X) = npq = 10 \times 0.4 \times 0.6 = 2.4$.
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