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  1. or download this
      for (@_) { @differences = (@differences, (($_-$mean)*($_-$mean))); }
  2. or download this
      foreach ( @_ ) {
      push @differences, $_ - $mean;
  }
  3. or download this
       my $standard = 0;
   for (@differences) { $standard = $standard + $_; }
   $standard = sqrt($standard/$sample_size);
   return $standard;
  4. or download this
      my $sum_diff = 0;
  map { $sum_diff += $_ } @differences;
  return sqrt($sum_diff / $sample_size);