Answer Happy

Please help to solve this probability problem. The numbers on
the line (excluding the question numbers like 1. 2. 3.) are the
final correct answers (for this question, the correct answers are
0.13, 17.08 and 2.72 respectively). Please give detailed steps
to explain how to get the final correct answer. Thanks!
8. Fill in the blanks Suppose X and Y are jointly continuous random variables whose joint density function is given by | 2e-20/ if x > 0 and 0 < y < x, f(x, y) := 0 otherwise. := {2 Cov(X,Y)= = 1.0.13 (2 decimal places)

9. Fill in the blanks Let Z be a standard normal random variable. Let W =1+eZ+a Z2 and X = 1+ Z2 and Y - -1 +eZ2. Cov(X,Y)= = 1. 17.08 (2 decimal places). Cov(W, Z) 2. 2.72 (2 decimal places).