use strict;
use warnings;
Always! They help, honest. They really do!
Here's a few problems with your code in no particular order:
$aver = addition(mynumbers)/($#mynumbers+1) ;in sub avg has a missing '@', should be:
$aver = addition(@mynumbers)/($#mynumbers+1) ;
Reading @numlist from STDIN allows you to enter each number, followed by <RETURN>. When you have entered each number you press <EOD>, which is usually <CTRL>D on UNIX and <CTRL>Z on Windows. I suspect you are entering each number on the same line, separated by a space (can't be certain though).
There are other tweeks you could make, but try these for now.
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