The random variables X and Y in Exercise 3, with variances found in Section 7.2, Exercise 11.
For the following joint distributions, find the probabilities for the random variable X - Y (the difference), and check that E(X - Y) = E(X) - E(Y) and that Var(X - Y) = Var(X) + Var(Y) if Cov(X, Y) = 0.

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Y=1 0.1 0.2 0.3 Y=20.05 0.15 0.2