1. Calculate Mean deviation, Coefficient of M.D. from the following data
`10,50,30,20,10,20,70,30`

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

`=(10+50+30+20+10+20+70+30)/8`

`=240/8`

`=30`

`x`	`|x - bar x| = |x - 30|`
10	20
50	20
30	0
20	10
10	20
20	10
70	40
30	0
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`240`	`120`

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

`delta bar x = 120/8`

`delta bar x = 15`


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

`=15/30`

`=0.5`

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