But my main goal is to display the average of that calculation

Well, that's not hard :) - actually more than trivial, you output values by printing them. So after Masem's code put either one of those

# with string interpolation
print "The average is $average.\n";

# or with string concat
print "The average is " . $average . ".\n";

# or with multiple arguments to print
print "The average is ", $average, ".\n";

# or using printf and rounding to 2 decimals
printf "The average is %.2f.\n", $average;
[download]

I suggest you try to get a good book on perl, e.g. Learning Perl (3rd edition) by our one and only merlyn. Also have a look onto our New Monks Info Page. There you will find lot's of sources of information on perl and tips to get started.

-- Hofmator