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    garywhjr's Avatar
    garywhjr Posts: 2, Reputation: 1
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    #1

    Feb 7, 2007, 11:58 AM
    probability
    Here is the data

    10 mg sub A Placebo
    headache 15 65
    n headache 17 3

    Question
    If two different subjects are randomly selected, find the probability that they will both have a headache.

    I think that it would be 15/100*17/99 but the answer that this gives is not right.:(:confused:

    any help in the right direction would be grealty appreciated
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Feb 7, 2007, 02:06 PM
    I don't understand your data, could you please clarify so I can help you?
    garywhjr's Avatar
    garywhjr Posts: 2, Reputation: 1
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    #3

    Feb 7, 2007, 03:04 PM
    Yes. The headache row is 15 had headache with 10 mg sub a and 65 had headache with placebo. Second row is 17 had no headache with 10 mg of sub a and 3 with placebo
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Feb 7, 2007, 03:23 PM
    Okay, you need to take the total with headaches, over the total number of patients, twice where the second one is minus one person with a headache so it's

    P =

    Does that make sense?
    Does it give the right answer?

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