Soit \( X \sim B(n, p) \)

\( E(X) = np \)

\( Var(X) = np(1-p) \)

Exemple
Soit \( X \sim B(10, 0.3) \)

\( P(X \leq 4) = \sum_{k=0}^{4} \binom{10}{k} (0.3)^k (0.7)^{10-k} \)