题目
X sim N(mu, sigma^2)，则 PX leq mu = ().A. (1)/(5)B. (1)/(4)C. (1)/(2)D. (1)/(3)
$X \sim N(\mu, \sigma^2)$，则 $P\{X \leq \mu\} = $ ().
A. $\frac{1}{5}$
B. $\frac{1}{4}$
C. $\frac{1}{2}$
D. $\frac{1}{3}$
题目解答
答案
C. $\frac{1}{2}$
A. $\frac{1}{5}$
B. $\frac{1}{4}$
C. $\frac{1}{2}$
D. $\frac{1}{3}$