单选题 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、

A. 0.333.
B、

B. 0.200.
C、

C. 0.167.

【正确答案】 C

【答案解析】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.