2. Calculate Mean deviation, Coefficient of M.D. from the following data
`85,96,76,108,85,80,100,85,70,95`

Solution:
Mean deviation :
Mean `bar x=(sum x)/n`

`=(85+96+76+108+85+80+100+85+70+95)/10`

`=880/10`

`=88`

`x`	`|x - bar x| = |x - 88|`
85	3
96	8
76	12
108	20
85	3
80	8
100	12
85	3
70	18
95	7
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`880`	`94`

Mean deviation of Mean
`delta bar x = (sum |x - bar x|)/n`

`delta bar x = 94/10`

`delta bar x = 9.4`


Coefficient of Mean deviation `=(delta bar x)/(bar x)`

`=9.4/88`

`=0.1068`

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