If the mean of `x_1 and x_2`, and that of `x_1,x_2,x_3,x_4` is `M_2`, the mean of `x_1 +x_2/a, x_3+ a, x_4- a` is

The mean of x_i and x_2 is M_1 and that of x_1,x_2,x_3,x_4 is M_2 . Then the mean of ax_1,x_3/a,x_4/a is

The mean of x_1,x_2 is 6 and mean of x_1,x_2,x_3 is 7, find the value of x_3

If the mean of x_(1),x_(2) is 7.5 and the mean of x_(1),x_(2),x_(3) is 8, then the value of x_(3) is

If the mean of x and 1/x is M, then the mean of x^2 and 1//x^2 is

If the mean of a set of observation x_1 , x_2 , …….x_10 is 20 then the mean of x_1 +4, x_2 +8, x_3+ 12, ………… x_10 +40 is

If the mean of a set of observations x_1 , x_2 ________ x_10 is 20. Find the mean of x_1 + 4, x_2 + 8, x_3 + 12,_________ x_10 +40.

If the mean of observations x_1.x_2,x_3…..x_n is barx then the mean of x_1+a,x_2+a,…...x_n+a will be