You can dispense with the addition, division,...
And how do you think the module arrives at its result? What it does is exactly addition and division — which of course suffers from the same floating point issues. Here's the relevant code snippet:
if (@data) {
my $sum=0;
$sum+=$_ foreach @data;
return $sum/scalar(@data);
} else {
return undef;
}
Anyhow, as has already been pointed out, the OP's problem has likely nothing whatsoever to do with those general floating point issues, but is presumably simply the result of having computed the sum incorrectly.
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