As long as List::Util is being brought into play, why not use sum() as well as min() and max()? Just push entries to an array, say @numbers, as long as conditions for continued entry are met, then, after a test for no numbers at all having been entered,
print 'The average of the numbers was ', sum(@numbers) / @numbers;
print 'The largest number was ', max @numbers;
print 'The smallest number was ', min @numbers;
(Admittedly, this approach may not be appropriate for homework.)
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