City Cab, Inc., uses two dispatchers to handle requests for service and to dispatch the cabs. The telephone calls that are made to City Cab use a common telephone number. When both dispatchers are busy, the caller hears a busy signal; no waiting is allowed. Callers who receive a busy signal can call back later or call another cab service. Assume that the arrival of calls follows a Poisson probability distribution, with a mean of 45 calls per hour, and that each dispatcher can handle a mean of 38 calls per hour. If management wants no more than 5% of the callers to receive a busy signal, how many dispatchers should be used?

2- City Cab, Inc., uses two dispatchers to handle requests for service and to dispatch the cabs. The telephone calls that are made to City Cab use a common telephone number. When both dispatchers are busy, the caller hears a busy signal; no waiting is allowed. Callers who receive a busy signal can call back later or call another cab service. Assume that the arrival of calls follows a Poisson probability distribution, with a mean of 45 calls per hour, and that each dispatcher can handle a mean of 38 calls per hour. If management wants no more than 5% of the callers to receive a busy signal, how many dispatchers should be used