Question: Lungs and smoke, again. Based on the statistics in Exercise, what's the probability that someone with the lung condition was a smoker?
Exercise: Lungs and smoke. Suppose that 23% of adults smoke cigarettes. It's known that 57% of smokers and 13% of nonsmokers develop a certain lung condition by age 60.
a) Explain how these statistics indicate that lung condition and smoking are not independent.
b) What's the probability that a randomly selected 60-year-old has this lung condition?