问题如下:
When it refers to the number of 1-10, the mean absolute deviation will be:
选项:
A. 2.5.
B. 3.6.
C. 4.7
解释:
A is correct.
mean x=5.5
|1-5.5|+|2-5.5|+|3-5.5|+|4-5.5|+|5-5.5|+|6-5.5|-|7-5.5|+|8-5.5|+|9-5.5|+|10-5.5|=25
25/10=2.5
为什么不是55,而是5.5?