POISSON
Category: Compatibility Function.
Description: Returns the Poisson distribution. Poisson distribution can be used to predict the number of events over a specific time.
Syntax: POISSON(x, mean, cumulative)
The POISSON function syntax has the following arguments:
X: the number of events.
Mean: the expected numeric value.
Cumulative: a logical value that determines the form of the probability distribution returned.
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If cumulative is TRUE, POISSON returns the cumulative Poisson probability that the number of random events occurring will be between zero and x inclusive.
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If cumulative is FALSE, it returns the Poisson probability mass function that the number of events occurring will be exactly x.