The customer arrival process for a given service is Poisson with an average arrival rate every 10 minutes. The duration of an appointment can be considered as Negative Exponential distribution with an average value equal to 8 minutes. Knowing that the system works with a server and that it cannot receive more than 5 customers, determine:

there)

ii) the average length of the queue;

the average number of customers per hour barred from entering;

iii) the average time that a customer stays in the system and in the queue.

b) Assuming that the system works with 2 servers, what is the average number of customers per hour barred from entering and what is the average queue length?