Which of the following sets of numbers has the greatest standard _英语解答

Which of the following sets of numbers has the greatest standard deviation?
A.2,3,4 B.2.5,3,3.5 C.1,1.25,1.5 D.-2,0,2 E.-20,21,21.5
这道题的书上答案为什么是D呢,我觉得是E,因为那个-20和21,21.5很远啊

人气：427 ℃　时间：2020-01-28 13:47:16

解答

OG上面的题目?
我觉得这题题目是不是题目有问题.
因为如果是-20,21,21.5的话,答案也太明显了.
我猜测E选项是20,21,21.5..