سؤال وجواب

bad gums may mean a bad mood. researchers discovered that 85% of people who have suffered a bad mood had periodontal disease, an inflammation of the gums. only 29% of healthy people have this disease. suppose that in a certain community bad moods are quite rare, occurring with only 10% probability. if someone has periodontal disease, what is the probability that he or she will have a bad mood?