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Probability HELP

  1. Nov 8, 2011 #1
    Suppose that for adults in a certain population 40% are male, 38% smoke, and 12% are female smokers. What is the probability that a randomly chosen adult smoker is a male?
    The Answer is apparently 0.6842
    I have no idea how!
  2. jcsd
  3. Nov 9, 2011 #2
    I've always solved these problems by thinking about them in concrete terms.

    Say there are 100 people.
    38 smoke
    12 are female smokers
    So there must be 26 male smokers.
    26/38 = ~0.6842
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