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  3. The odds that a certain event will occur is the ratio of the probability that the event will occur to the probability that it wi

The odds that a certain event will occur is the ratio of the probability that the event will occur to the probability that it wi

admin2009-05-19  53
问题 The odds that a certain event will occur is the ratio of the probability that the event will occur to the probability that it will not occur. If the odds that Pat will win a prize are 4 to 3, what is the probability that Pat will not win the prize?
选项 A、1/4
B、1/3
C、3/7
D、4/7
E、1/7
答案C
解析 某事件发生的可能性(odds)为这件事将发生的概率与这件事不发生概率的比值。若Pat赢得一项奖的可能性为4比3，Pat赢不到该奖项的概率是多大?
解：本题的正确答案是(C)。odds=发生的概率/不发生的概率=4/3，so，Pat赢不到该奖项的概率=不发生的概率/（发生的概率+不发生的概率）=3/（4+3）=3/7
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