Mean of n observation x(1),x(2),….,x(n) ...

Mean of n observation `x_(1),x_(2),….,x_(n)` is `barx`. If an observation `x_(q)` is replaced by `x'_(q)` then the new mean is

`barx-x_(q)+x'_(q)`

`((n-1)barx+x'_(q))/(n)`

`((n-1)barx-x'_(q))/(n)`

`(nbarx-x_(q)+x'_(q))/(n)`

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