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Math Help - Reviewing for exam.. Probability question

  1. #1
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    Reviewing for exam.. Probability question

    Males and females are observed to react differently to a given set of circumstances. Ithas been observed that 70% of the females react positively to these circumstances,whereas only 40% of males react positively. A group of 20 people, 15 female and 5 male, was subjected to these circumstances.

    Pick a random response
    1) Find the probability that the response was negative
    2) Given that the response was negative, what is the probability that it was a male?
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  2. #2
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    Would one be 3/4(.3) + 1/4(.6)?
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  3. #3
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    Quote Originally Posted by vexiked View Post
    Would one be 3/4(.3) + 1/4(.6)?
    Yes.

    I suggest drawing a tree diagram, by the way.
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