3 Kelly has to complete the following reflection problem: triangle ABC with vertices A (-8,-6) B (-5, -2) and C (2, -1) in the x-axis. What rule should she use? O change x and y to negatives O switch x and y switch x and y and add negative to y flip pre-image over the x-axis and take opposite y value flip pre-image over the y-axis and take opposite x value

The discrete random variables x and y take integer values with joint probability distribution given by f (x,y) = a(y−x+1) 0 ≤ x ≤ y ≤ 2 or =0 otherwise, where a is a constant. 1 tabulate the distribution and show that a = 0.1.2 find the marginal distributions of x and y. 3 calculate cov(x,y).4 state, giving a reason, whether x and y are independent. 5 calculate e(y|x = 1).