MathPHP\Statistics\Average::trimean PHP Метод

    public static function trimean(array $numbers)
    {
        $quartiles = Descriptive::quartiles($numbers);
        $Q₁ = $quartiles['Q1'];
        $Q₂ = $quartiles['Q2'];
        $Q₃ = $quartiles['Q3'];
        return ($Q₁ + 2 * $Q₂ + $Q₃) / 4;
    }