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Question 4 The following table shows the attached probability distribution of two discrete random variables X and Y. N X 3 0.10 O 0.12 0.06 Y 0.05 0.10 0.11 2 0.02 0.16 0.28 When answering the following questions, use four digits after the decimal point (for example, 1.4513).Question 13 (0.25 points) a. What is the covariance between X and Y? Question 14 (0,25 points) b. Determine the marginal probability distribution for X. Question 15 (0,25 points) c. Calculate the standard deviation of Y. Question 16 (0,25 points) d. Calculate the variance of the linear function W=2X+Y