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For Poisson distribution with rate λ: P(X = k) =
Ae^(-λ) λ^k / k!
Bλ × k
Cλ^k
DC(n,k) λ^k
Answer & Solution
Correct answer: A. e^(-λ) λ^k / k!
Poisson(λ): P(X = k) = e^(-λ) λ^k / k! for k = 0, 1, 2, ... Models rare events in fixed time (radioactive decays, traffic accidents). Mean = λ. Variance = λ.
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