(Solved): Two tetrahedral dice are rolled. (A tetrahedral die is a die with four faces, which are numbered \( ...

Two tetrahedral dice are rolled. (A tetrahedral die is a die with four faces, which are numbered \( 1,2,3,4) \). Let \( X(i, j)=i+j \), where the first die shows \( i \) and the second die shows \( j \), then find the value of \( E(X) \) and \( V(X) \).