14. The probability of A is 60% and the probability of B is 50%, what is the most possible probability that neither A nor B would happen?

　　(A) 0.80

　　(B) 0.40

　　(C) 0.75

　　(D) 0.55

　　(E) 0.68

　　15. In an insurance company, each policy has a paper record and an electric record. For those policies having incorrect paper record, 60% also having

　　incorrect electric record; For policies having incorrect electric record, 75% also having incorrect paper record. 3% of all policies have both incorrect paper and

　　incorrect electric records. If we randomly pick out one policy,what's the probability that the one having both correct paper and correct electric records?

　　(A) 0.80

　　(B) 0.94

　　(C) 0.75

　　(D) 0.88

　　(E) 0.92

　　16. There are 1200 respondents to a poll, each favoring their preference for candidates A,B, and C. 54% favored A, 48% favored B, and 42% favored C, and

　　there is 30% favored both A and B. what's the largest possible number of respondents favoring C, but not C&B, nor C&A?

　　(A) 25%

　　(B) 30%

　　(C) 28%

　　(D) 38%

　　(E) 40%

　　答案

　　1.解： median为20000 ， range为50000 ，则本题剩下两数的最小值为0 ，0 ，最大 值为 20000，2000 ，则平均值最小值为：

　　(0+0+20000+40000+50000)/5 =22000

　　平均最大值为：