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Airplane Problem

  1. Feb 17, 2007 #1
    Ok, I was looking at some solutions and they dont seem correct. Here is the problem:
    An airline knows that the probability a person holding a reservation on a certain flight will not appear is 10%. The plane holds 90 people.
    a) If 95 reservations have been solf, find the prob. that the airline will be able o accommodate everyone appearing on the plane.
    b) How many reservatiosn should be sold so that the ariline can accomodate everyone who appears for the flight 99% of the time?
  2. jcsd
  3. Feb 18, 2007 #2


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    Is it not a homework problem?
    Solution: Assume that arrival of a person with reservation is independent of other passengers.
    Let X be the no. of passengers with reservation who finally turns up and N be the no. of reservations issued.
    a) X~Bin(95,0.9). Find P(X<=90).
    b) Find N such that P(X<=90)=0.99, when X~Bin(N,0.9).
    Last edited: Feb 18, 2007
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