题目
A standard normal distribution has:
选项
A.no tails
B.fat tails
C.infinite tails
D.asymmetric tails
答案
C
解析
The tail ends of a normal distribution stretch to infinity, although the area under these tails becomes insignificant past ±3 standard deviation from mean. 正态分布的尾端延伸到无穷大，尽管这些尾端下方与平均值之间的差值超过±3个标准偏差的区域非常小。