How to find average from array in php?

Question

Example:

$a[] = \'56\';
$a[] = \'66\';
$a[] = \'\';
$a[] = \'58\';
$a[] = \'85\';
$a[] = \'\';
$a[] = \'\';
$a[] = \'76\';
$a[] = \'\';
$a[] = \'57\';
         


        

Answer 1

echo array_sum($a) / count(array_filter($a));