8:57 1 .. . Name: Suppose a surgical team routinely performs two different types of surgeries. The probability of success for surgery A 1. is 85% and the probability of success for surgery B is 90%. If a patient who had surgery A is randomly selected and a patient who had surgery B is randomly selected what is the probability that both will respond that their surgeries failed? 2. In a large high school 15% of Sophomores, 25% of Juniors, and 55% of Seniors drive to school. According to the registration office 24% of students are Sophomores, 26% are Juniors, and 30% are Seniors. Suppose we select one student from this school at random and record which class they are in as well as whether they drive to school or not. (a) Draw a tree diagram to model this chance process. (b) Find the probability that the student drives to school. (c) Suppose the chosen person drives to school. What is the probability that he or she is a Senior? Starnes/Tabor, The Practice of Statistics, 6/e 2018 BFW Publishers, Inc. O Send a chat