Airlines will often overbook their flights (selling more tickets than they have seats) because not all customers show up for some flights. The proportion that doesn’t show up varies greatly, depending on the time of day and the airport. For this exercise, let’s suppose any given customer has a 5% chance of not showing up and an airline has sold 44 tickets for a 42-seat plane. 

a. What is the probability that there won’t be enough seats for the customers who show up? 

b. What is the probability that there will be enough seats for the customers who show up? 

c. On average, how many customers will show up?