Binomial distribution calculator

Set the number of trials, the probability of success and k to see the probabilities, the mean and the spread.

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Questions students ask

When is a binomial model suitable?

A fixed number of independent trials, each with two outcomes and the same probability of success.

What formula does it use?

P(X = k) = ⁿCₖ pᵏ(1 − p)ⁿ⁻ᵏ; mean np, variance np(1 − p).

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