An appliance manufacturer maintains a repair center for its customers. Based on past experience, 30% of all appliances sent in for repair have a mechanical problem (M), and 70% have an electrical problem (E). If the problem is mechanical, 90% of the appliances can be repaired and returned to the customer (RR); in the remaining 10% of the cases the appliance must be replaced (REP) with a new unit. If the problem is electrical, 60% can be repaired and returned to the customer, with the remaining 40% being replaced with a new unit. 6) 6) If an appliance at the repair center is selected at random and it needs to be replaced with a new unit, what is the probability that the appliance has an electrical problem? (Round your answer to 4 decimal places.) A) .2800 B) .5714 C).9032 D).9709 E).4000 7) What percentage of all appliances sent to the repair center are replaced (REP) with a new unit? A) 3% B) 31% C).84% D) 50% E) 28% 7)