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joe_average:  2.2
jack_average: 3.2
...
joe_average:  3.2
jack_average: 4.2
stan_average: 5.1

 
my %stats;
while (<FILE>) {
...
    printf( "%19s: %5d %8.2f\n", $_, $stats{$_}{count},
             $stats{$_}{sum} / $stats{$_}{count} );
}