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Poisson Distribution
P(X=x)  =  e^{λ} 
λ^{x}
x!

λ≥0, x≥0
Expected (average) number of events:λ =
P(X = x):
P(X ≤ x):
P(X ≥ x):
Poisson Distribution Calculator is a free online tool for calculations of probabilities of events following poisson distribution.
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