Bluebook试题10 · 第 8 题

Bluebook试题10 · 原库模块 3 · Q8 原库参考解析

The dot plots represent the distributions of values in data sets A and B. 

Which of the following statements must be true?
I. The median of data set A is equal to the median of data set B.
II. The standard deviation of data set A is equal to the standard deviation of data set B.