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  1. or download this
    use Statistics::Descriptive;
$stat = Statistics::Descriptive::Full->new();
...
{
    print "key = $_, count = $f{$_}\n";
}
  2. or download this
    key = -0.784, count = 8
key = 3.732, count = 34
key = 8.248, count = 15
key = 12.764, count = 3
key = 17.28, count = 1
  3. or download this
    http://onlinestatbook.com/2/graphing_distributions/graphics/freq_poly.
+jpg