Airline Reservations. A particular airline published that the no-show rate for reservations is 21%. In other words, the probability is 0.21 that a person making a reservation will not turn up to board the flight. For the next flight, 180 people have reservations. What is the probability that

a. exactly 30 do not take the flight?

b. between 30 and 35, inclusive, do not take the flight?

c. at least 25 do not take the flight?

d. at most 28 do not take the flight?

e. Comment on the accuracy of the normal approximation in this case.