A vending machine dispenses hot chocolate or coffee. Service time is 30 seconds per cup and is constant. Customers arrive at a mean rate of 71 per hour, and this rate is Poisson-distributed.
a. Determine the average number of customers waiting in line. (Round your answer to 2 decimal places.)
b. Determine the average time customers spend in the system. (Do not round intermediate calculations. Round your answer to 2 decimal places.)
c. Determine the average number in the system. (Do not round intermediate calculations. Round your answer to 2 decimal places.)