Suppose that 10% of the clerical staff in an office smoke cigarettes. Research shows that 60% of

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Suppose that 10% of the clerical staff in an office smoke cigarettes. Research shows that 60% of smokers and 15% of nonsmokers suffer a breathing illness by age 65.
(a) Do these percentages indicate that smoking and this breathing illness are independent?
(b) What’s the probability that a randomly selected 65-year-old employee who has this breathing illness smokes?
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