The rates of on-time flights for commercial jets are continuously tracked by the U.S. Department of Transportation. Recently, Southwest Air had the best rate with 80 % of its flights arriving on time. A test is conducted by randomly selecting 17Southwest flights and observing whether they arrive on time. (a)  Find the probability that exactly 3 flights arrive late. (b)  Would it be unusual for Southwest to have 4 flights arrive late? (Enter YES or NO)

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 The rates of on-time flights for commercial jets are continuously tracked by the U.S. Department of Transportation. Recently, Southwest Air had the best rate with 80 % of its flights arriving on time. A test is conducted by randomly selecting 17Southwest flights and observing whether they arrive on time. (a)  Find the probability that exactly 3 flights arrive late.

(b)  Would it be unusual for Southwest to have 4 flights arrive late?
(Enter YES or NO)    

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