NO.PZ2018062016000050
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
。。。。。。。。。。。