问题
单项选择题
A random variable follows a continuous uniform distribution over 27 to 89. What is the probability of an outcome between 34 and 38（）
A. 0.0546.
B. 0.0645.
C. 0.0719.
答案
参考答案：B
解析：
P(34≤X≤38)=(38-34)/(89-27)=0.0645.