BETA.DIST(x, alpha, beta, cumulative, [,A] [,B])

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

xThe number between A and B 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 density function (equal to)
A(Optional) The lower bound to the interval of x.
B(Optional) The upper bound to the interval of x.

* This function was added in Excel 2010 to replace the BETADIST function.
* This is also more consistent with the NORMDIST function.
* The beta 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 bell shaped curve at "x" is returned. This uses the probability density function.
* If "A" is left blank, then ??
* If "B" is left blank, then ??
* All the values are greater than zero
* If the parameters are equal, the distribution is symmetrical.
* If either parameter is 1 and the other parameter is greater than 1, the distribution is J-shaped.
* If alpha is less than beta, the distribution is said to be positively skewed (most of the values are near the minimum value).
* If alpha is greater than beta, the distribution is negatively skewed (most of the values are near the maximum value).
* For the Microsoft documentation refer to
* For the Google documentation refer to

1=BETA.DIST(2,8,10,TRUE,1,3) = 0.685
2=BETA.DIST(-2,8,10,TRUE,-5,3) = 0.282
3=BETA.DIST(3,1,1,TRUE,2,3) = 1
4=BETA.DIST(3,1,1,TRUE,,3) = 1
5=BETA.DIST(3,-1,1,TRUE,2,2) = #NUM!
6=BETA.DIST(3,1,1,TRUE,2,) = #NUM!
7=BETA.DIST(3,1,-1,TRUE,2,2) = #NUM!
8=BETA.DIST(3,1,1,TRUE,2,2) = #NUM!
9=BETA.DIST(3,1,1,TRUE,2,"some text") = #VALUE!

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