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Assume the likelihood that any flight on Northwest Airlines

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Assume the likelihood that any flight on Northwest Airlines arrives within 15 minutes of the scheduled time is .90. We select four flights from yesterday for study.
a. What is the likelihood all four of the selected flights arrived within 15 minutes of the scheduled time?
b. What is the likelihood that none of the selected flights arrived within 15 minutes of the scheduled time?
c. What is the likelihood at least one of the selected flights did not arrive within 15 minutes of the scheduled time.

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Let X denote the number of flight arriving within 15 minutes of the scheduled time. Then X is binomially distributed with parameters n = 4 and p = ...

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