NO.PZ2019040801000017
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
- 因为是标准正态分布,所以一定mean是0,方差是1,所以这道题就一个标准差,就只能查z(1)的,对吗?
- 如果没说是标准的,直说是正态分布,那么就是68%,对吗?