For three fully discrete insurance products on the same (x), you are given: a. Z1 is the present value random variable for a 20-year term insurance of 50.
b. Z2 is the present value random variable for a 20-year deferred whole life insurance of 100.
c. Z3 is the present value random variable for a whole life insurance of 100.
d. E[Z1] = 1.65 and E[Z2] = 10.75
e. Var(Z1) = 46.75 and Var(Z2) = 50.78

Required:
Calculate Var(Z3).