2. A public health researcher examines the medical records of a large sample of men who died in 1999. Of this sample, she finds that 22.4% died with heart disease. Further, she finds that one third of the men in the sample had at least one parent with heart disease, and of this latter group, 32.7% died of heart disease.
a) What percentage of men in the sample died of heart disease and neither parent had heart disease?
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Say you had 100 people in the sample. 22 of them died of heart disease. 33 of the patients had one parent with heart disease. 32.7% of them died. So 32.7% of 33 is 11ish. That means 22-11=11 people who died who did not have parents with heart disease which is about 10%.
11 is about 10% of 100, I meant to say. Which is the answer.