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<?php $students = [ 'Бельмондо' => ['Математика' => 69, 'Русский' => 85, 'Информатика' => 58], 'Делон' => ['Математика' => 89, 'Русский' => 68, 'Информатика' => 77], 'Годар' => ['Математика' => 75, 'Русский' => 81, 'Информатика' => 75], ]; $average_scores = []; foreach ($students as $student => $scores) { $average_scores[$student] = array_sum($scores) / count($scores); } arsort($average_scores); foreach ($average_scores as $student => $average_score) { echo $student . ': ' . $average_score . "<br>"; } ?>
Results:
Делон: 78
Годар: 77
Бельмондо: 70.666666666667