I was given this question to solve: The Men's Department of a large store employs one tailor for customer's fitting. The number of customers requiring fitting has a mean arrival time rate of 24 per hour . Customers are fitted on a first come first served basis and are willing to wait for the tailor's service. The time it takes to fit a customer has a mean of 2 minutes.
What is the average number of customers in the fitting room?
How much time should a customer expect to spend in the fitting room ?
What percentage of the time is the tailors idle?.
This is how I approached the question : I changed the 2 minutes to hours and had 1/30. Next I solved question one using queuing theory and the solution was 47 customers. For the second question I had 2 hours per time . But I am a bit confused as to how to get the approach in solving the third question. Are my answers correct for question 1 and 2. And how will I get the answer to question 3.?