use strict;
use warnings;

my @data = get_data(); # or however you get them

my %count;
foreach my $datum (@data) {
    ++$count{$datum};
}

my %percentile;
my $total = 0;
foreach my $datum (sort { $a <=> $b } keys %count) {
    $total += $count{$datum};
    $percentile{$datum} = $total / @data;
}
[download]

its giving incorrect percentile values :( to find percentile rank of score x out of n scores:
(number of scores below x)/n*100 = percentile rank
need to sort the hash first, i used index value of the array to find number of scores below x. x is value of hash taken one by one and returning the percentile

oh, below, not below or equal. Just switch the order of the two statements in the last loop. I usually only do the *100 when it's time to print, but I added it for you.

use strict;
use warnings;

my @data = get_data(); # or however you get them

my %count;
foreach my $datum (@data) {
    ++$count{$datum};
}

my %percentile;
my $total = 0;
foreach my $datum (sort { $a <=> $b } keys %count) {
    $percentile{$datum} = $total / @data * 100;
    $total += $count{$datum};
}
[download]

sorry, got logged out and posted msg as anonym.... the formula for percentile is given by me, sorry for confusion...... plz help

will keep that in mind, thanks :)