(5) Five hundred adults over 50 years of age were classified according to whethe

Question

(5) Five hundred adults over 50 years of age were classified according to whether they smoked or not, and if they smoked, were they a moderate or heavy smoker. Also, each one was asked whether he or she had ever had a heart attack. The results are given. Heart Attack Yes No Total Do not smoke3 Moderate smoker 60 65125 Heavy smoker9 Totals180320 500 220 250 What is the probability of selecting a person who either has had a heart attack, or who is a heavy smoker? a. What is the probability of selecting a person who is a heavy smoker and who did not have a heart attack? b.

Explanation / Answer

a) P(heart attack or heavy smoker) = P(heart attack) + P(heavy smoker) - P(heart attack and heavy smoker)

                                                        = 180/500 + 125/500 - 90/500

                                                        = 0.43

b) P(heavy smoker and did not have a heart attack) = 35/500 = 0.07

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