问题
单项选择题
The number of days a particular stock increases in a given five - day period is uniformly distributed between zero and five inclusive. In a given five -day trading week, what is the probability that the stock will increase exactly three days（）
A. 0.333.
B. 0.200.
C. 0.167.
答案
参考答案：C
解析：
If the possible outcomes are X: (0,1,2,3,4,5) , then the probability of each of the six outcomes is 1/6 =0.167.