A certain flight arrives on time 80 percent of the time. Suppose 132 flights are randomly selected. Use the normal approximation to the binomial to approximate the probability that
​(a) exactly 97 flights are on time.
​(b) at least 97 flights are on time.
​(c) fewer than 118 flights are on time.
​(d) between 118 and 120​, inclusive are on time.