题目
Which one of the following statements about the normal distribution is NOT accurate?
选项
A.Kurtosis equals 3.
B.Skewness equals 1.
C.The entire distribution can be characterized by two moments, mean and variance.
D.The normal density function has the following expression: 「huixue_img/importSubject/1564169385764065280.png」
答案
B
解析
The skewness of the normal distribution is 0, not 1.The kurtosis of the normal distribution is 3, the normal distribution can be completely described by its mean and variance, and the density function of the normal distribution is as shown. 正态分布的偏度为0，而不是1。 正态分布的峰度为3，正态分布的均值和方差可以完全描述正态分布，正态分布的密度函数表达也是正确的。