partern and that service times follow an exponential probablity distribution with a service rate of is requests per hour, (Round your answers to foor dedimal piaces.) (a) What is the probability that no requests for assistance are in the system? (b) What is the average number of requests that will be waiting for service? (c) Whak is the twerage wazing time (in hours) before service begins? (d) Wist itihe average time (in hours) at the feference desk (wating time plus servici time)? (e) What is the probateity that a new arrival has to wait for service?