Which could be the entire interval over which the function, f(x), is positive?
-
X
-3
-2
-1
0
1
2
f(x)
-2
0
2
2
0
-8
-10
-20
(0, 1)
(-2, 1)
(-0,0)
(1,4)
AWN

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).