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Let barx be the mean of x1,x2,……,xn and ...

Let `barx` be the mean of `x_1,x_2,……,x_n` and `bary` the mean of `y_1,y_2……,y_n` `barz` is the mean of `x_1,x_2,…. ,x_n, y_1, y_2` is equal to :

A

`barx+bary`

B

`(barx+bary)/2`

C

`(barx+bary)/n`

D

`(barx+bary)/2n)

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