a car service station, there are two service lines. The random variables X and Y are the portions of time that line 1 and line 2 are in use, respectively. The joint probability sity function for (X, Y) is given by f(z, w) = {,." S{(² + y³), 0sx s1;0sy s1 elsewhere. a) If Z=X+Y, the sum of two proportions, find Var(Z) b) Find Cov (X,Y)

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