#!/usr/bin/perl -w

open ( FH, 'faketext.txt' );
while ( <FH> ) {
     chomp;
     push @fake, $_;

use strict;

 
sub mean {
    my (@data) = @_;
    my $sum;
    foreach (@data) {
        $sum += $_;
    }
    return ( $sum / @data );
}
sub median {
    my (@data) = sort { $a <=> $b } @_;
    if ( scalar(@data) % 2 ) {
        return ( $data[ @data / 2 ] );
    } else {
        my ( $upper, $lower );
        $lower = $data[ @data / 2 ];
        $upper = $data[ @data / 2 - 1 ];
        return ( mean( $lower, $upper ) );
    }
}
sub std_dev {
    my (@data) = @_;
    my ( $sq_dev_sum, $avg ) = ( 0, 0 );
    
    $avg = mean(@data);
    foreach my $elem (@data) {
        $sq_dev_sum += ( $avg - $elem )**2;
    }
    return ( sqrt( $sq_dev_sum / ( @data - 1 ) ) );
}
my ( $data, @dataset );
print "Please enter data, separated by commas: ";
$data = <STDIN>;
@dataset = split( /[\s,]+/, $data );

print "Median: ",        median(@dataset),  "\n";
print "Mean: ",          mean(@dataset),    "\n";
print "Standard Dev.: ", std_dev(@dataset), "\n";