B(n,p)

Craddock Binomial

GCSE STATISTICS PRACTICE

Developed by Gordon John Craddock to help GCSE students master the binomial distribution. From exact probabilities to cumulative tables, GJC's question bank covers every exam style you'll encounter.

KEY FORMULAP(X = r) = C(n, r) · p^r · (1–p)^n–r | E(X) = np | Var(X) = np(1–p)

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Exact Probability

P(X = r)

Cumulative (≤)

P(X ≤ r)

At Least (≥)

P(X ≥ r)

Mean & Variance

E(X), Var(X)