# POISSON.DIST

POISSON.DIST(x, mean, cumulative)

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

 x The number of events. mean The expected numeric value. cumulative A 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
 * 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

 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!