136 A researcher finds that of 9H2 men who died in 2002 221

1.3-6. A researcher finds that, of 9H2 men who died in 2002, 221 died from some heart disease. Also, of the 982 men. 334 had at least one parent who had some heart disease. Of the latter 334 men, 111 died from some heart disease. A man is selected from the group of 982. Given that neither of his parents had some heart disease, find the conditional probability that this man died of some heart disease.

Solution

Number of man neither of whose parents had heart disease = 982-334 = 648

Number of man died due to heart disease neither of whose parents had heart disease = 221-111 = 110

therefore required probablity = 110/648 = 0.170