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    larso121212's Avatar
    larso121212 Posts: 1, Reputation: 1
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    #1

    May 5, 2010, 06:40 PM
    What is the probabilty that exactly 3 of the 20 will be HIV positive?
    Suppose we have a group of 10 light users and 10 heavy users.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    May 6, 2010, 01:00 AM

    There is not enough information...

    We need the probability that a light user is positive/negative and the probability that a heavy user is positive/negative.
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