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American 107 105

European 33 12

Asian 55 47

Question 4: Suppose that 23% of adults smoke cigarettes. It is known that 57% of smokers and 13% of nonsmokers develop a certain lung condition by age of 60.

a. What is the probability that a randomly selected 60-year-old has this lung condition?

b. Knowing the selected person has this lung condition what is the probability that he is a smoker as well?

c. What is the probability that the selected person is a smoker and has this lung condition?

Question 5: Consider the data set given in problem (3). One person is randomly selected from that sample.

a. What is the probability that the person is a sta ?

b. What is the probability that the person is a sta and owned an Asian car?

c. What is the probability that the person is a sta or owned a non-Asian car?

d. Given that the person selected is a sta what is the probability that he/she owned non-Asian car?

Question 6: Suppose a computer chip manufacturer rejects 2% of the chips produced because they fail presale testing.

a. What is the probability that thefth chip you test is therst bad one yound?

b. What is the probability that out of 10 chips tested at most 2 are bad ones?

c. What is the probability that it takes you less than 5 tests to nd the rst bad one?

2