H2 Maths 6.2 - Binomial Distribution: P(X = r), E(X), Var(X)

What you will learn

• 12 candidates each accept independently with probability 0.3; X = number accepting is Bin(12, 0.3).
• P(X = 4) = C(12, 4) (0.3)^4 (0.7)^8, which is about 0.231.
• P(X >= 2) via the complement: 1 - P(X = 0) - P(X = 1), which is about 0.915.