medium=1; mean=(31+92)/5=21/5=4.2; difference=4.2-1=3.2

来源: 木木真木于 2018-12-08 19:00:58 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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medium=1; mean=(3*1+9*2)/5=21/5=4.2; difference=4.2-1=3.2