Originally Posted by

**jason0** Hi, I was wondering if anyone could help me out with where to get started on this prblem

**Bad gums may mean a bad heart. Researchers discovered that 78% of people who have suffered a heart attack had periodontal disease, an inflammation of the gums. Only 30% of healthy people have this disease. Suppose that in a certain community heart attacks are quite rare, occurring with only 11% probability.**

**A. If someone has periodontal disease, what is the probability that he or she will have a heart attack?**

**B. If 40% of the people in a community will have a heart attack, what is the probability that a person with periodontal disease will have a heart attack?**