During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes. What is the probability of three calls in five minutes (to 4...

During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes. What is the probability of three calls in five minutes (to 4 decimals)? What is the probability of no calls in a five-minute period (to 4 decimals)