A single server queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of 5 customers per hour and an average service rate of 14 customers per hour. The probability of 4 customers in the system is : O a. 0.01046 Ob 0.9895 O c 0.6429 Od 0.9837 Which of the following would not generally be considered a characteristic of a functional product? Select one: Low product variety Ob Long product life High profit margins Od Low obsolescence