CalcMountain

Poisson Distribution Calculator

Enter the average rate (lambda) and the number of events (k) to compute exact and cumulative Poisson probabilities, plus distribution statistics.

Inputs

Results

P(X = k)

0.140374

P(X <= k)

0.265026

P(X > k)

0.734974

Mean (lambda)

5.0000

Variance

5.0000

Std Dev

2.2361

Frequently Asked Questions

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