SOLUTION: I have a Statistic problem that I can't seem to figure out: In sum, here is the problem: A shuttle seats 19 passengers. Over the years the probability of passengers showing up i

Question 911507: I have a Statistic problem that I can't seem to figure out:
In sum, here is the problem:
A shuttle seats 19 passengers. Over the years the probability of passengers showing up is 90%. They have an overbooking policy and books more than seats available. If they sell 20 tickets, what is the probability of there not being enough seats? Correct Ans. is: 0.122
How did they come up with that answer?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A shuttle seats 19 passengers. Over the years the probability of passengers showing up is 90%. They have an overbooking policy and books more than seats available. If they sell 20 tickets, what is the probability of there not being enough seats?
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That would be the propability that 20 people actually show up.
Ans:: 0.90^20 = 0.122
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Cheers,
Stan H.
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