POISSON

POISSON(x, mean, cumulative)

Returns the probability distribution function OR the cumulative probability function for a poisson distribution.

xThe number of events.
meanThe expected numeric value.
cumulativeA logical value indicating the type of function to use:
False (or 0) = [[probability distribution function]] (equal to)
True (<> 0) = [[cumulative probability function]] (equal to or less than)

REMARKS
* POISSON.DIST was added in Excel 2010 to replace this function.
* The poisson distribution is a [[discrete distribution]]
* If "x" is not an integer, it is truncated.
* If "x" is not numeric, then #VALUE! is returned.
* If "mean" is not numeric, then #VALUE! is returned.
* If "mean" = 0, then #NUM! is returned.
* If "x" < 0, then #NUM! is returned.
* If "x" = 0, then
* If "cumulative" = False, then the height of the curve at "x" is returned.
* If "cumulative" = True, then the area under the curve to the left of "x" is returned.
* For the Microsoft documentation refer to support.microsoft.com

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


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