- array_sum: documentation ( source)
- print_r: documentation ( source)
- pow: documentation ( source)
<?php
$A = array(9,4,-3,-10);
$sum = array_sum($A) / count($A);
foreach($A as $key => $i) {
$devs[$key] = pow($num - $mean, 2);
print_r($devs[$key]);
}
?>