Question: obtaining distributions

Hello again Maple experts, I have four nonstochastic variables s11, s12,s21,s22.. from there I have 2 random variables X1 and X2 (to begin, it may be a uniform distribution U[-1,1]) . I generate the random variables y1 and y2: y1 = min(s11+X1, s21+X2) y2 = min(s12+X1, s22+X2) 1. How could I obtain with MAPLE the distribution of Z= (y1)^(1/2)+log((40-y2)*(80+2*y2-3y1))? 2. And how could I obtain the expected value of Z? Thanks in advance for any help. Regards, Jean
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