An airline, believing that 4% of passengers fail to show for flights, overbooks (sells more tickets than there are seats). Suppose that for a particular flight involving a jumbo-jet with 266 seats, the airline sells 280 tickets. The number after "-" in part a is the correct answer. What I need to know is how to solve for part b. Thanks!
a. What is the expected number of ticket holders that will fail to show for the flight? - 11.2
b. What is the probability that the airline will not have enough seats for all the ticket holders who show for the flight?