POISSON.DIST(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)

* This function was added in Excel 2010 to replace the POISSON function.
* For an illustrated example refer to the page under [[Distributions]]
* The poisson distribution is a [[discrete distribution]]
* The poisson distribution is used when events occur at random.
* 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.
* You can use the BINOM.DIST function
* For the Microsoft documentation refer to support.microsoft.com
* For the Google documentation refer to support.google.com

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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