QUESTION 4 Exim Bank employs one teller to serve its customers. Customers arrive at an average of 20 customers per hour, according to a Poisson distribution. The teller serves them at a rate of 30 customers per hour, following approximately the exponential distribution in service times. Determine the following:

i. The length of the queue in the bank

ii. Length of queue being served

iii. Waiting time in the bank iv. Waiting time in the queue v. What is the