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The mean deviation from mean of the obse...

The mean deviation from mean of the observations `a, a + d, a + 2d,… a + 2 nd ` is :

A

`( n (n +1) d ^(2))/( 3)`

B

`(n ( n +1) d ^(2))/( 2)`

C

`a + (n ( n +1) d ^(2))/( 2)`

D

`(n ( n +1) |d|)/(2 n +1)`

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The correct Answer is:
D
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