Poisson distribution calculator
Set the average rate λ and k to see the probability of exactly k events and of k or fewer.
Learn Poisson distribution properly
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Questions students ask
When is a Poisson model suitable?
Events happen singly, independently and at random, at a constant average rate.
What formula does it use?
P(X = k) = e^(−λ)λᵏ/k!; mean = variance = λ.
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