单选题
If for a given spin,the pointer shown in the figure above is equally likely to stop on any of the numbered sectors,what is the probability that the pointer will stop on an odd-numbered sector?(Assume that the pointer cannot stop on a dividing line between sectors.)
【正确答案】 D
【答案解析】若对于给定的转盘,左图所示的指针停于各个数字部分的概率都相等。问该指针将停在奇数部分的概率是多少?(假设该指针不会停在两个不同部分的分界线上。)
图中的转盘被不同的数字分成了13个部分,其中奇数有6个:1,3,5,7,9,11,而指针停于各个部分的概率相等,所于指针停于奇数部分的概率为[*]。