random.betavariate

[maria_jenny at my-deja.com]

If I transform the mean and the variance function to two functions:
a a-function and a b-function. Then I calculate a and b from this
functions and uses those values when in the call to
random.betavariate(a,b), then after a lot of iterations it should
converge to the mean value, but it does not.

Ex. mean=0.5
    standard deviation=0.2
    a=0.125
    b=0.125




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