题目
In a discrete uniform distribution with 20 potential outcomes of integers 1 to 20, the probability that X is greater than or equal to 3 but less than 6, P(3 ≤ X ＜ 6), is:
选项
A.0.10.
B.0.15.
C.0.20.
答案
B
解析
B is correct. The probability of any outcome is 0.05, P(1) = 1/20 = 0.05. The probability that X is greater than or equal to 3 but less than 6, which is expressed as P(3 ≤ X ＜ 6) = P(3) + P(4) + P(5) = 0.05 + 0.05 + 0.05 = 0.15 B正确。 任何结果的概率都是0.05,P(1) = 1/20 = 0.05。X大于或等于3但小于6的概率，表示为P(3 ≤X ＜ 6) = P(3)＋P(4)＋P(5) = 0.05＋0.05＋0.05 = 0.15。