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The first flight out of Phoenix airport had a late departure. If the next three flights departed on time, minimum how ma

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The first flight out of Phoenix airport had a late departure. If the next three flights departed on time, minimum how ma

by Vincen » Sat Aug 14, 2021 11:45 pm

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The first flight out of Phoenix airport had a late departure. If the next three flights departed on time, minimum how many subsequent flights need to depart from Phoenix on time, for the airport's on-time departure rate to be higher than \(90\%?\)

A. 6
B. 7
C. 9
D. 10
E. 11

Answer: B

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