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