Group them using a hash
my %vals_by_type;
while (<DATA>) {
chomp;
my ($type, $val) = split ' ';
push @{ $vals_by_type{$type} }, $val;
}
Then average each type individually
use List::Util qw( sum );
for my $type (sort keys %vals_by_type) {
my $vals = $vals_by_type{$type};
my $avg = sum( map $_/@$vals, @$vals );
printf("%s %.2f\n", $type, $avg);
}
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