Homework Answers
here E(T) =0.6*E(A)+0.3*E(B)+0.1*E(C)=0.6*10+0.3*30+0.1*50=20
therefore V(T)=0.6*Var(A)+0.3*Var(B)+0.1*Var(C)+0.6*(E(T)-E(A))2+0.3*(E(T)-E(B))2+0.1*(E(T)-E(C))2
=0.6*102+0.3*202+0.1*202+0.6*(20-10)2+0.3*(20-30)2+0.1*(20-50)2 =400
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