The average of n numbers \[{{x}_{1}},{{x}_{2}},{{x}_{3}},...{{x}_{n}}\] is M. If \[{{x}_{n}}\] is replaced by \[x',\] then new average is

The average of n numbers \[{{x}_{1}},{{x}_{2}},{{x}_{3}},...{{x}_{n}}\

1.	The average of n numbers \[{{x}_{1}},{{x}_{2}},{{x}_{3}},...{{x}_{n}}\] is M. If \[{{x}_{n}}\] is replaced by \[x',\] then new average is
A.	\[M-{{x}_{n}}+x'\]
B.	\[\frac{nM-{{x}_{n}}+x'}{n}\]
C.	\[\frac{(n-1)M+x'}{n}\]
D.	\[\frac{M-{{x}_{n}}+x'}{n}\]
Answer» C. \[\frac{(n-1)M+x'}{n}\]

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The average of n numbers \[{{x}_{1}},{{x}_{2}},{{x}_{3}},...{{x}_{n}}\] is M. If \[{{x}_{n}}\] is replaced by \[x',\] then new average is

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