POISSON.DIST

POISSON.DIST(x, mean, cumulative)

Returns the probability of getting less than or equal to a particular value in a poisson distribution.

xThe number of events.
meanThe expected numeric value.
cumulativeA logical value indicating the type of function to use:
True = cumulative probability function
False = probability mass function

REMARKS
* Added in Excel 2010.
* This function replaces the POISSON function.
* For the Microsoft documentation refer to support.microsoft.com

 A
1=POISSON.DIST(2,5,FALSE) = 0.084
2=POISSON.DIST(2,5,TRUE) = 0.125
3=POISSON.DIST(2,2,1) = 0.677
4=POISSON.DIST(-2,2,1) = #NUM!

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