Q14 of 174 Page 597

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 = ?

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


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


Now, their combined mean is,





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


= )

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