如何计算加权平均数
人气：479 ℃ 时间：2020-04-22 21:37:44
解答
x拔=（x1f1 + x2f2+ ...xkfk）/n,其中f1 + f2 + ...+ fk=n,f1,f2,…,fk叫做权.通过数和权的成绩来计算
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