It seems this is more a question for DCDFLIB than it is a Perl question.

However, if you want to manipulate the mean and variance, isn't that just a matter of arithmetic? You just normalize your incoming data based on a mean and a variance down to a standard distribution where the mean is 0 and the variance is 1, and go from there.

Not that I remember that much -- my last Stats class was over 20 years ago. ;)

ps: You can link to a CPAN module using [cpan://{CPAN module name here}] like this: Math::CDF.