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A certain flight arrives on time 90 percent of the time. Suppose 160 flights are randomly selected. Use the normal approximation to the binomial to

A certain flight arrives on time 90 percent of the time. Suppose 160 flights are randomly selected. Use the normal approximation to the binomial to approximate the probability that a) a) exactly 140 flights are on time.(b) at least 140 flights are on time.(

c) fewer than138 flights are on time.(

d) between 138 and 141, inclusive are on time.

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