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use strict;
use warnings;
...
B,16
C,17
D,18

A:  max=13 min=10 sum=46 mean=11.5
B:  max=16 min=15 sum=31 mean=15.5
C:  max=17 min=17 sum=17 mean=17
D:  max=18 min=18 sum=18 mean=18