# WEIBULL

WEIBULL(x, alpha, beta, cumulative)

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

 x The numeric value at which to evaluate the function. 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)

 REMARKS
 * WEIBULL.DIST was added in Excel 2010 to replace this function.* The weibull distribution is a [[continuous distribution]]* If "x", is nonnumeric, then #VALUE! is returned.* If "x" < 0, then #NUM! is returned.* If "x" = 0, then ??* If "alpha" = 0, then #NUM! is returned.* If "alpha" is nonnumeric, then #VALUE! is returned.* If "beta" = 0, then #NUM! is returned.* If "beta" is nonnumeric, then #VALUE! is returned.* 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.* This function can be used in reliability analysis, such as calculating a device's mean time to failure.* For the Microsoft documentation refer to support.microsoft.com* For the Google documentation refer to support.google.com

 A 1 =WEIBULL(105, 20, 100, TRUE) = 0.930 2 =WEIBULL(105, 20, 100, FALSE) = 0.036 3 =WEIBULL(5, 1, 2, 3) = 0.918