On average, 9 babies are born per 24-hour day at a hospital in Indianapolis.
a) What is the probability that at least one baby will be born today between 6 am and 6 pm?
b) What is the probability that at least one baby will be born in the next hour.
c) What is the probability that exactly 4 babies will be born between 6 am and 6 pm?
d) What is the probability that exactly 4 babies will be born on each of the next two 12-hour shifts?