BETA.DIST 
BETA.DIST(x, alpha, beta, cumulative [,A] [,B]) 
Returns the probability of getting a specific value between 0 and 1 for different distribution shapes. 
x  The number between A and B from the distribution. 
alpha  The first parameter. 
beta  The second parameter. 
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) 
A  (Optional) The lower bound to the interval of x (0..1) (0) 
B  (Optional) The upper bound to the interval of x (0..1) (1) 
REMARKS 
* This function was added in Excel 2010 to replace the BETADIST function and include an option for probability distribution. * For an illustrated example refer to the page under [[Distributions]] * The beta distribution is a [[continuous distribution]] * This function is a two variable function. * If "alpha" = "beta", the distribution is symmetrical. * If "alpha" = 1 and "beta" > 1, the distribution is Jshaped. * If "alpha" > 1 and "beta" = 1, the distribution is Jshaped. * If "alpha" < "beta", the distribution is said to be positively skewed (most of the values are near the minimum value). * If "alpha" > "beta", the distribution is negatively skewed (most of the values are near the maximum value). * 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. * If "A" is left blank, then 0 is used. * If "B" is left blank, then 1 is used. * You can use the BETA.INV function to return the inverse of the cumulative probability function for a beta distribution. * You can use the GAMMA.DIST function to return the probability function OR the cumulative probability function for a gamma distribution. * For the Microsoft documentation refer to support.microsoft.com * For the Google documentation refer to support.google.com 

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