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标题: PREP PS1里的一道题，不会做 [打印本页]

作者: davidsfo 时间: 2009-1-13 19:52 标题: PREP PS1里的一道题，不会做

58.

In the graduating class of a certain college, 48 percent of the students are male and 52 percent are female. In this class 40 percent of the male and 20 percent of the female students are 25 years old or older. If one student in the graduating class is randomly selected, approximately what is the probability that he or she will be less than 25 years old?

(A) 0.90

(B) 0.70

(D) 0.30

(E) 0.25

作者: moodraie 时间: 2009-1-14 09:49

The answer is B.

0.48*0.6+0.52*0.8=0.704

作者: davidsfo 时间: 2009-1-15 19:00

谢谢楼上的回答。

作者: feierer 时间: 2009-1-19 07:03

我的答案和楼上一样,B

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