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<?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; }