3. In a group of 40 people, 10 people are healthy. The 30 unhealthy people have either high blood pressure, high cholesterol, or both. Suppose 15 have high blood pressure and 25 have high cholesterol. If a person is randomly selected from this group, what is the probability that they have both high blood pressure and high cholesterol? Drawing a Venn diagram will help! a. 0.25 b. 0.38 c. 0.63 d. 0.75 e. 1.00 4. Do seat belts save lives? A public health researcher conducted a crosssectional study of fatality outcomes and seat belt use of 100 victims of motor vehicle accidents in a large city over the course of one month. There were a total of 30 deaths. Of the 100 victims, 50 wore seat belts. Of those victims who wore seat belts, 10 died. What is the probability that a victim randomly selected from this group was alive, given that they did not wear a seat belt? Filling in the following table will help. a. 0.2 b. 0.4 c. 0.6 d. 0.7 e. 0.8 5. Suppose there are 100 students in the class, and 10 of the students currently have the u. Over the next week, 5 new students develop the u. What is the prevalence of u at the end of the week? a. 5/100 b. 15/100 0. 5/90 d. 15/90 e. Cannot be determined