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Check the answers ~

  1. Sep 23, 2008 #1
    check the answers plz~

    Ive done the following questions but not sure about my answers because i have different answers with my friend.. so please tell me whether its correct or wrong.. thank you!!:smile: Question 2. In a region, 20% of the adult population are smokers,
    0:9% are smokers with emphysema, and 0:2% are non-smokers with emphysema.
    (a) What is the probability that a person, selected at random, has emphysema?
    0.9% * 20% + 0.2% * 80% = 9/1000 * 1/5 + 2/1000 * 4/5 = 17/5000
    (b) Given that the selected person is a smoker, what is the probability that this
    person has emphysema?
    0.9% = 9/1000
    (c) Given that the selected person is not a smoker, what is the probability that
    this person has emphysema?
    0.2% = 2/1000 = 1/500
     
  2. jcsd
  3. Sep 23, 2008 #2

    mathman

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    Science Advisor
    Gold Member

    Re: check the answers plz~

    Looks right to me.
     
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