NO.PZ2018062016000084
问题如下：
Which of the following is incorrect description about normal distribution?
选项：
A.kurtosis equals 3
B.skewness equals 3
C.excess kurtosis equals 0
解释：
B is correct. For normal distribution, the skewness equals 0, the kurtosis equals 3, and the excess kurtosis = sample kurtosis - 3 , which equals 0.
根据Sample kurtosis=3; Excess kurtosis=0
为什么不是C
