单选题

A discrete uniform distribution consists of the following twelve values:

-2.5 5.3 6.7 8.8 -4.6 9.2
3.3 8.2 1.4 0.8 -5.3 6.9

On a single draw from the distribution, the probability of drawing a value between -2.0 and 2.0 from the distribution is closest to:

【正确答案】 A
【答案解析】

First order the values from smallest to largest.

-5.3 -4.6 -2.5 0.8 1.4 3.3
5.3 6.7 6.9 8.2 8.8 9.2

Then note that two of the twelve values are between -2.0 and 2.0. Thus, the probability of a draw from the distribution being between -2.0 and 2.0 is 2/12 = 0.16667.