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Thread: pobability, pls help

  1. #1
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    pobability, pls help



    [Question]
    A survey by the Canadian frequent flyers association revealed that
    60% of its members made independent airline reservations last year.
    If two members are selected at random, what is the probability that.


    A) both made reservations last year ?
    b) at least one made a reservation last year?
    c) Only one made a reservation last year?


    [Difficulty]
    Im jsut very confused and dont know where to go. Ive been working
    this problem for a week and i dont know if im on the right track. I
    havent taken math in over 10 yrs.

    [Thoughts]
    A)60X60= 36
    B)18/60=30

    I dont know if im on the right track at all. just need some help pls

  2. #2
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    (A) P(both) = 0.6 * 0.6 = 0.36

    (B) P(at least 1) = 1 - P(neither) = 1 - (0.4 * 0.4) = 0.84

    (C) P(exactly 1) = 1 - [ P(both) + P(neither) ] = 1 - [ 0.36 + 0.16 ] = 0.48

  3. #3
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    Thank you very much for your help

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