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

The A.M. of n observations is M. If the sum of \[n-4\] observations is

1.	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.	\[\frac{n\,M-a}{4}\]
B.	\[\frac{n\,M+a}{2}\]
C.	\[\frac{n\,M-A}{2}\]
D.	n M + a
Answer» B. \[\frac{n\,M+a}{2}\]

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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

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