среднее арифметическое(In mathematics and statistics, the arithmetic mean ( /ˌærɪθˈmɛtɪk ˈmiːn/, stress on first and third syllables of "arithmetic"), or simply the mean or the average (when the context is clear), is the sum of a collection of numbers divided by the count of numbers in the collection. • ‘The quantity commonly referred to as ‘the' mean of a set of values is the arithmetic mean… also called the average.' || Geometric means give relatively greater weight to smaller values than arithmetic means and are therefore a conservative measure of average sample size.'wikipedia.org)
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