I refactored you code. Please study and ask questions:

###################################################
#                                                 #
#   2/24/21                                       #
#      Program takes finds the average in an      #
#      array and lists out the numbers that were  #
#      above the average found.                   #
#                                                 #
###################################################

### Limitations - added 3/1/2021
### This code will throw a fatal "Illegal division by zero"
### error if @numbers doesn't contain at least one element.


   my @numbers = qw(4 12 18 21 35);

   my $average = find_average(@numbers);
   print "The average found for this list is: $average \n" ;
   
   my @above_avg = above_average($average, @numbers);
   print "The numbers that were found above average are: @above_avg \n
+";

   sub find_average  
   {
      my @nums = @_;
      my $sum;
      
      foreach my $num (@nums) 
      {
         $sum += $num;
      }
      
      my $avg = $sum / @nums;
      return $avg;
   }

   sub above_average  
   {
       my ($average_num, @nums) = @_;
       my @final_list;
       
       foreach my $num (@nums) 
       {
          if ($num > $average_num) 
          {         
             push @final_list, $num
          }
       }
       return @final_list;
    }
    
__END__
PRINTS:
The average found for this list is: 18 
The numbers that were found above average are: 21 35
[download]

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