To support a tree damaged in a storm, a 12-foot wire is
secured from the ground to the tree at a point 10 feet off
the ground. The tree meets the ground at a right angle.
At approximately what angle does the wire meet the
ground?
33.6
39.8
50.2
56.4

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).