âåëè÷èíà (a), ïîëó÷àåìàÿ äåëåíèåì ñóììûíåñêîëüêèõ (n) âåëè÷èí (a1, a2,..., an) íà ÷èñëî ñëàãàåìûõ: a = (a1 + a2 +... + an)/n.
