2. A stock market trader buys 100 shares of stock A and 200 shares of stock B. Let X and Y be the price changes of A and B, respectively, over a certain time period. Assume the joint PMF of X and Y is...

Find the marginal PMF of X

Extracted text: 2. A stock market trader buys 100 shares of stock A and 200 shares of stock B. Let X and Y be the price changes of A and B, respectively, over a certain time period. Assume the joint PMF of X and Y is uniform over the set of integers x and y satisfying -2 sxs 2, x - 1 sysx+ 1. Find the marginal PMF of X.