Answer: The probability that none of the calls would result in a reservation would be 0.72%.
Since there is an 18% chance that there would be a reservation, then there is a 72% chance that there is not a reservation.
Our goal is to determine the likelihood that there are no calls. Or that the 72% chance event happens 15 times.
We can use the following expression to find that repeated probability.
(0.72)^15 = 0.0072 or 0.72%
