MathPHP\Statistics\Average::contraharmonicMean PHP 메소드

A special case of the Lehmer mean, L₂(x), where p = 2. https://en.wikipedia.org/wiki/Contraharmonic_mean

public static contraharmonicMean ( array $numbers ) : number
$numbers	array
리턴	number

    public static function contraharmonicMean(array $numbers)
    {
        $p = 2;
        return self::lehmerMean($numbers, $p);
    }

Average