Continuous random variables X and Y have joint density function f(x, y) = K(x² + xy), 0< x < 1, 0 < y< 1, where K is a constant. a) Find K and the joint density function. f(x, y) 0 < x < 1, 0< y< 1 b) Find the probability that X is less than 0.8 and Y is less than 0.6. P(X < 0.8, Y < 0.6) c) Find the marginal density function for X. fx(x) = 0 < x <1 d) Find the marginal density function for Y. fr(y) : 0 < y<1

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