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Math Help - Probabilities

  1. #1
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    Probabilities

    1. The problem statement, all variables and given/known data

    The marketing department of a magazine collects the following information for a group of randomly selected subscribers. Of households that subscribe to at least one of their three magazines:
    25 subscribe to teen world only
    19 to star watch only
    15 to fashionz only
    41 to teen world and star watch
    28 to star watch and fashionz
    32 to teen world and fashionz
    11 to all three magazines
    a) Illustrate with a venn diagram

    b) Determine the probability that a randomly selected subscriber receives
    i) all three magazines
    ii) exactly two magazines
    ii) at least two magazines
    iv) Fashionz
    v) star watch or teen world


    2. Relevant equations



    3. The attempt at a solution

    b)

    i) N(A)=11
    N(S)=138

    P(A)=11/138

    ii) 21+17+30/138=34/69

    iii) 21+17+30+11/138 = 79/139

    iv) 15/138
    v)
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  2. #2
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    Tell me how you came up with 138.
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  3. #3
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    Quote Originally Posted by ANDS! View Post
    Tell me how you came up with 138.
    Well, in my venn diagram.

    http://i48.tinypic.com/2k4pdz.jpg
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