ONLY ANSWER PROBLEM 4 please 4 Consider the information give

4 Consider the information given in Exercise 3. Suppose further that the marginal mean and variance of X are E(X) = 24 and sigma^2x = 9, and the marginal variance of Y is sigmay^2 = 36.25. (a) Find the marginal mean of Y. (Hint. Use Proposition 4.6-1, or the Law of Total Expectation given in 4.3.15.) (b) Find the covariance and the linear correlation coefficient of X and Y. (Hint: Use Proposition 4.6-3.)

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