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- Let X and Y be two jointly continuous random variables. Let Z = X² + Y². Show that F2(=) = L Fxr(V=- yř 19) – Fxy(-v/= = y"l»)] fv (w) dy .Suppose X and Y are independent random variables with E(X) =2, E(Y)=3,V(X)=4,V(Y)=16. Finda)E(5X-Y) b)V(5X-Y) c)COV(3X+Y,Y) d)COV(X,5X-Y)Let X, Y and Z be three independent random variables such that E(X)=E(Y)=E(Z)=1 and E(X2)-E(Y²)=2E(Z²)=10. Then Var(X+Y+Z) is equal to:
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