With reference to Exercise 5.76, find both marginal densities and use them to find the probabilities that

(a) \(X>0.8\);

(b) \(Y

Data From Exercise 5.76

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5.76 If two random variables have the joint density f(x, y) = = 6 0 (x + y) for 0 < x < 1, 0 < y < 1 elsewhere