NO.PZ2022123001000036
问题如下：
Compared to the normal distribution with the same variance, the distribution with more probability in the left tails is best described as :
选项：
A.Fat-tailed B.Platykurtic C.positively skewed解释：
The excess kurtosis is positive, indicating that the distribution is “fat-tailed”; therefore, there is more probability in the tails of the distribution relative to the normal distribution.
Positively skewed distribution has more probability in the right tail. Platykurtic distribution is a thin-tailed distribution.
解析第一句说由于excess kurtosis是正数所以是fat tail，但怎么判断excess kurtosis是正的呢？题干里只说和normal distribution的variance一样，left tail的probability更大。谢谢！
