According to the Bureau of Transportation Statistics, 81.9% of American Airline flights were on time during 2017. Assume this percentage still holds true for American Airlines. Using the normal approximation to the binomial distribution, determine the probability that of the next 30 American Airlines flights,

a. Fewer than 22 flights will arrive on time.

b. Exactly 26 flights will arrive on time.

c. 21, 22, 23, or 24 will arrive on time.

d. 24, 25, 26, 27, or 28 flights will arrive on time.