问题如下:
The probability that a standard normally distributed random variable will be less than one standard deviation above its mean is:
选项:
A.0.6827.
B.0.8413.
C.0.3173.
D.0.1587.
解释:
B is correct
考点:正态分布查表
解析:F(1) = 0.8413
可以用背的几个关键点中间68%对应的是均值周围一倍标准差吧?