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<?php
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// Created with PHP 7.0
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function rms(array $numbers)
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{
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$sum = 0;
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foreach ($numbers as $number) {
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$sum += $number**2;
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}
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return sqrt($sum / count($numbers));
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}
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echo rms(array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
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