GAMMA.DIST(x, alpha, beta, cumulative)

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

xThe number from the distribution.
alphaThe first parameter to the distribution.
betaThe second parameter to the distribution.
cumulativeA logical value indicating the type of function to use:
True / 1 = cumulative probability function (less than)
False / 0 = probability mass function (equal to)

* This function was added in Excel 2010 to replace the GAMMADIST function.
* The gamma distribution is a continuous distribution.
* If "cumulative" = True, then the area under the curve to the left of "x" is returned. This uses the cumulative probability function.
* If "cumulative" = False, then the height of the curve at "x" is returned. This uses the probability mass function.
* All the values are greater than zero.
* For the Microsoft documentation refer to
* For the Google documentation refer to


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