The social networking site Facebook is popular in the United States and around the world. This table shows the number of Facebook users and populations in four countries in 2011. All of these counts are in millions of people.13
(a) What is the probability that a black male smoker develops lung cancer?
(b) What is the probability that at least one of four Japanese-American women who smoke develops cancer? Do you need any assumptions for this calculation?
(c) If the four women were from the same family, would you question any assumptions used in answering the previous item?