The mean deviation of the data 3,10,10,4,7,10,5 from the mean is (a) 2             (b) 2.57              (c)3          (d) 3.57

Explanation

Given data is, `3,10,10,4,7,10,5`

Here, `n=7,barx=(3+10+10+4+7+10+5)/​=7`

Mean deviation from mean is
`=1/n​(∑∣x−barx∣)`

`=(4+3+3+3+0+3+2​)/7=(18)/7​`

`=2.57`