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【OG20-P171-162题】
Sixty percent of the members of a study group are women, and 45 percent of those women are lawyers. If one member of the study group is to be selected at random, what is the probability that the member selected is a woman lawyer?
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题目:一个学习小组中60%是女性,其中45%的女性是律师,假设要在小组中任意选一名,问被选的人是女律师的可能性是多少。
解:题目可这样理解:小组中女律师占总数的百分之几?假设小组总数为1.则女律师的比例为60%*45%=27%,即任选一名是女律师的可能为0.27.
题目讨论 (1条评论)

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huang642
这题难度怎么会有680+。。
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0 回复 2019-05-11 07:39:50