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Probability : Proportion Distribution Problem

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Airline company officials find that 86% of all people who make reservations show up for their flights. If an airline has accepted 240 reservations and if there are 213 available seats, find the probability that the airline will have a seat for each person who has reserved one and who shows up.

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A proportion distribution problem is solved. The solution is concise.

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This is a proportion distribution question.
The expected proportion of showing up is p=0.86
Then the standard deviation is ...

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