An average of 3 people come to a barber shop per hour and the service time for one person
averaged 15 minutes. Observations made in this shop for sufficient time
As a result, the probability distribution of the number of people in the system is as follows:
found. The average number of customers waiting in the queue for this system,
the average time the customer spent in the system and no queues at any given moment.
Calculate the probability of not having customers.
Person in the system
number
0 1 2 3 4 5 6
Probability 0.05 0.10 0.20 0.25 0.15 0.15 0.10