3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $frequency = 19; $resultsCount = 319000; $result = (pow($frequency/2, 2) / $resultsCount - (pow($frequency/2, 2) / $resultsCount) * ((0 + 0 + 0)*3 /100)) * 100; var_dump($result);
based on Nd3ua
Output for 4.3.0 - 7.2.0
float(0.028291536050157)