Q. 144.7( 3 Votes )

Let be the mean of x1, x2, …., xn and be the mean of y1, y2, …yn. If is the mean of x1, x2, …., xn, y1, y2…, yn, then = ?
A.

B.

C.

D.

Answer :

(given)..............(i)


(given)..............(ii)


Now, their combined mean is,





From equation (i) and eq.(ii)..


= )

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