ii$)$ Consider an M$/$M$/1$ queue

A$.$ Packets arrive at a range of $10$ per hour. The average service completion time

is $150$ seconds. What is the expected number of packets in the system?

B$.$ How long on average does each packet spend in the queue and also waiting in

the buffer?

C$.$ Calculate the proportion of time that a M$/$M$/1/$N queueing system is empty.