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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!! 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

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