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Just a note
But take care to note whether it is giving the proportion (P) of the distribution that is less than the Zvalue you give it, or 1P which is the proportion of the distribution greater than the Zvalue you give it, in other words the proportion in this distribution's uppertail.
For example R's pnorm function gives the proportion less than (the standard normal quantile) Z  and this is true of its cumulative probability functions for every other distribution. Whereas in Statistica, if you enter the Zvalue as X with no boxes clicked, it gives the proportion that is less than Z. If you click (1cumulative P), Statistica gives the proportion that is greater than Z. BEWARE!!!
