Suppose that the number of linkages (N) that come off of an assembly line in an hour is a random variable with E(N) = 50 and V(N) = 4. Suppose also that the length of each linkage (L_i for i = 1, 2, 3,...,N) are also random variables all with E(L_i)= 30 cm and V(L_i)= 9 cm². If (after each hour) these linkages are connected end-to-end to form a long linkage and if L is the total length of this long linkage, determine E(L) and V(L).