Which one of the following can be considered as appropriate pair of values of regression coefficient of y on x and regression coefficient of x on y ?

It is given that $$\overline X = 10$$, $$\overline Y = 90$$, $${\sigma _X} = 3$$, $${\sigma _Y} = 12$$ and $${r_{XY}} = 0.8$$. The regression equation of X on Y is

If a variable takes values 0, 1, 2, 3, ......., n with frequencies 1, C(n, 1), C(n, 2), C(n, 3), ......., C(n, n) respectively, then the arithmetic mean is

Consider the following statements

1. Variance is unaffected by change of origin and change of scale.

2. Coefficient of variance is independent of the unit of observations.

Which of the statements given above is/are correct?