tt gwd 15-7

If each of the 8 employees working on a certain project received an award, was the amount of each award the same ?

(1)            The standard deviation of the amounts of the 8 awards was 0.

(2)            The total amount of the 8 awards was $10,000.

答案是a

请问标准差的定义是什么？

我怎么觉得应该选e呢

多谢

标准方差 可以理解为 与平均值之差的平方和

mm可以搜索以下标准方差的公式 就明白了

谢谢

gg什么时候考？