CALC.poisson(x, mean, cumulative)

Returns the Poisson distribution. A common application of the Poisson distribution is predicting the number of events over a specific time. X is the number of events. Mean is the expected numeric value. Cumulative is a Boolean value that determines the form of the probability distribution returned. If Cumulative is true, the function returns the cumulative Poisson probability that the number of random events occurring will be between zero and x inclusive; if false, it returns the Poisson probability mass function that the number of events occurring will be exactly x.

Example

CALC.poisson(2, 5, true);

// returns 0.124652

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