Suppose that X,Y, and Z are jointly distributed random variables, that is, they are defined on the same sample space. Suppose that we also have the following. E(X)=2Var(X)=27E(Y)=0Var(Y)=43 E(Z)=4Var(Z)=1 Compute the values of the expressions below. E(X+1)=E(55X5Z)=Var(2Y)+5=E(4 Z2)=.