The overlapping depends a lot of the size of the sample. To find the standard deviation of each population is easy:
use Statistics::Basic qw(stddev);
#generate a lot of random numbers, by the preferred way, ie:
for (1..1000){
$number1= int(rand(100000000));
push @listofnumbers1, $number1;}
my $stddev1 = stddev(@listofnumbers1);
#repeat the process
push @listofnumbers2, $number2;
my $stddev2 = stddev(@listofnumbers2);
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