If the mean of `x` and `(1)/(x)` is `M`,the mean of `x^(3)` and `(1)/(x^(3))` is

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

The mean of x - 1, x and x + 1 is

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

Mean of x, 1/x is m then the mean of x^3,1/x^3 is______

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