Give Me Your Money bank knows they get on average 18 calls per hour on weekday mornings. Round probability answers to 4 decimal places, i.e. XXXX DO NOT enter as a percent. What is the probability they get 16 calls in one and a half hours? A. What is the probability they get 20 or less calls in one hour? A What is the probability they get 12 calls in one hour? P(4<=X<=12) in 30 minutes?.