Problem Solving
试题详情
题目：
The table shows the numbers of packages shipped daily by each of five companies during a 4-day period. The standard deviation of the numbers of packages shipped daily during the period was greatest for which of the five companies?
选项:
A、A
B、B
C、C
D、D
E、E
答案:
B
提问：
老师 请问这题为什么选E选项，我上数学单科的时候 老师讲了一道原题，是选E的，她说先算极差，留下B和E，又因为B选项的平均数=极差=20， 所以这道题选E
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