Bihar Prohibition Constable 27 Feb 2022 Paper

Question : 24 of 100

Marks: +1, -0

If x̅ is the mean x1, x2, .........., xn and y̅ is the mean of y1, y2 .........., yn then the mean of x1, x2 .........., xn, y1, y2, .........., yn is -