<?php

error_reporting(-1);

$rates = array(2,2,3,8,3,5,1,7,3,6,2,5,7,3);

$rates_sum = array_sum($rates);
$rates_count = count($rates);
$avg_rate = round($rates_sum / $rates_count);

echo "There was total {$rates_count} points, their sum is {$rates_sum}\nAverage rating is {$avg_rate}";