Question: 11. Consider the information given in Exercise 1 in Section 4.3 on the joint distribution of the volume, X, of online monthly book sales, and

11. Consider the information given in Exercise 1 in Section 4.3 on the joint distribution of the volume, X, of online monthly book sales, and the volume, Y, of monthly book sales from the brick and mortar counterpart of a bookstore. An approximate formula for the monthly profit, in thousands of dollars, of the bookstore is 8X + 10Y. Find the expected value and variance of the monthly profit of the bookstore.

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