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The A.M. of n observations is M. If the...

The A.M. of n observations is M. If the sum of n - 4 observations is a, then the mean of remaining 4 observations is :

A

`(n M - a)/(4)`

B

`(n M + a)/(4)`

C

`(n M - a)/(2)`

D

n M + a

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The correct Answer is:
A
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