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Unformatted text preview: ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ 由由由由D 由由由由 由由由由由n由由由由由由 由由n由5由由由 由由n由由由由由由由由由5由由由由 由由由由由由由 p=5由q=5 由由p=5 q由由由 由由n由由由25由由 由由由由由由由由由5由由由 由由由由q=5 p由由由 由由 由由由由由由由由由p 由由由由由25由由 [由由] 由由由:p^2q=5k 由由由由由由由由由,由由由由由由由: (1)p=5,k=pq (2)q=5,k=p^2 由由由由由D (p^2)(q^2)=5kq (由由由由由) 由由由由由由由由由由 (1)5kq=5(pq)(q)=25q^2 (2)5kq=5(p^2)(5)=25p^2 由由由由 p 2 q 2 由由由由! ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ 58. 7090­!­item­!­187;#058&005463 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 (C) 0.45 (D) 0.30 (E) 0.25 ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ 由由由由B 由由由由 由the graduating class 由由x由由由 48 x由 100 52 x由 Female由 100 Male 由 40 48 x 由0.192x 100 100 20 52 x =0.104x Female由25 years old or older由 100 10...
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This note was uploaded on 12/05/2012 for the course BUSINESS Finance taught by Professor Zheng during the Winter '05 term at Xiamen University.

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