The underlying DCDFLIB routine cdfnor() actually does take mean and stddev parameters, but the XS code (Perl binding) which calls the DCDFLIB routine uses hardcoded values for mean and stddev (0.0 and 1.0). This is no big problem, however, as you can easily scale/displace the return value yourself. Just multiply by the stddev, and add the mean, e.g. 

use Math::CDF qw(qnorm);

for my $p (0.33, 0.67) {
    print qnorm($p) * 2.5 + 44, "\n";
}

[download]

which gives 

42.9002170858169
45.0997829141831

[download]

In reply to Re: qnorm question by almut
in thread qnorm question by Anonymous Monk

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