Mean of a certain number of observations...

Mean of a certain number of observations is ` x ` . If each observation is divided by `m(m!=0)` and increased by `n` , then the mean of new observation is (a) `( x )/m+n` (b) `( x )/n+m` (c) ` x +n/m` (d) ` x +m/n`

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