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: /home/kckglobal/www/portal/vendor/azjezz/psl/src/Psl/Math/

files >> /home/kckglobal/www/portal/vendor/azjezz/psl/src/Psl/Math/mean.php

 <?php

declare(strict_types=1);

namespace Psl\Math;

use function count;

/**
 * Returns the arithmetic mean of the given numbers in the list.
 *
 * Return null if the given list is empty.
 *
 * @param list<int|float> $numbers
 *
 * @pure
 */
function mean(array $numbers): ?float
{
    $count = (float) count($numbers);
    if (0.0 === $count) {
        return null;
    }

    $mean = 0.0;
    foreach ($numbers as $number) {
        $mean += (float)$number / $count;
    }

    return $mean;
}

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