POISSON.DIST
Category: Statistical Function.
Description: Returns the Poisson distribution.
Syntax: POISSON.DIST(x, mean, cumulative)
The POISSON.DIST function syntax has the following arguments:
X: number of events.
Mean: expected numeric value.
Cumulative: logical value that determines the form of the probability distribution returned.
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If cumulative is TRUE, then POISSON.DIST returns the cumulative Poisson probability that the number of random events occurring will be between zero and x inclusive.
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If FALSE, POISSON.DIST returns the Poisson probability mass function that the number of events occurring will be exaclty x.