The Centers for Disease Control and Prevention reported that there were 443,000 smoking-related deaths in the United States in a recent year. The numbers of deaths caused by various illnesses attributed to smoking are as follows:

a. What is the probability that a smoking-related death was the result of lung cancer?

b. What is the probability that a smoking-related death was the result of either ischemic heart disease or other?

Illness Number Lung cancer 128,900 Ischemic heart disease 126,000 Chronic obstructive pulmonary disease 92,900 Other 95,200 Total 443,000