Phone Calls Arrive at the Rate of 30 Per Hour

Short Answer

Phone calls arrive at the rate of 30 per hour at the reservation desk for a hotel.
A)Find the probability of receiving three calls in a five-minute interval of time.
B)Find the probability of receiving exactly seven calls in 15 minutes.
C)If no calls are currently being processed, what is the probability that the desk employee can take ten minutes break without being interrupted?