Question

In a bank customer arrive at a counter, being manned by a single

individual, according to a Poisson input process with a mean rate of 30

per hour. The time required to serve a customer has an exponential

distribution with a mean of 90 seconds. Find the average queue length.

(a) 2

(b) 3

(c) 5

(d) 6​

Answer 1

Answer:

3 is the write answer as I think