Using for loop to sum the total
@a = (1, 2, 3, 4, 5, 6, 7, 8, 9);
$running_sum = 0;
for ($loop_index = 0; $loop_index <= $#a + 1; $loop_index++) {
$running_sum += $a[$loop_index];
}
print "Average value = " . $running_sum / ($#a + 1);
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