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Math Help - Probability problem

  1. #1
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    Probability problem

    On a cold winter morning in Alaska, the probability that Emery's car will start is 0.45 and the probability that Diana's car will start 0.62

    What is the probability that neither car will start?


    0.45 X 0.62 = 0.279? - both cars will start (P(A and B) = P(A) x P(B)?
    0.45 x 0.38 = 0.17 - start Emery and not start Diana
    0.55 x 0.62 = 0.341
    0.55 x 0.38 = 0.209( that both will not start)

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    Last edited by terminator; January 17th 2011 at 03:30 PM.
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  2. #2
    bjm
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    I believe you are correct.
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by terminator View Post
    On a cold winter morning in Alaska, the probability that Emery's car will start is 0.45 and the probability that Diana's car will start 0.62

    What is the probability that neither car will start?


    0.45 X 0.62 = 0.279? - both cars will start (P(A and B) = P(A) x P(B)?
    0.45 x 0.38 = 0.17 - start Emery and not start Diana
    0.55 x 0.62 = 0.341
    0.55 x 0.38 = 0.209( that both will not start)

    Need feedback.
    Thanks
    The probability that E's car will not start is 1-0.45=0.55

    The probability that D's car will not start is 1-0.62=0.38

    Now assuming that the cars starting /not starting are independent the probability that neither start is 0.55x0.38=0.209

    Note the required assumption is so unlikely as to make the question ludicrous

    CB
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