Exercise 1. In towns A, B, C, D, and E, the prevalence of appendectomies is 2.1%, 2.9%, 3.1%, 3.8%, and 3.9%. 1. Calculate the coefficient of variation for the five towns. [10] 2. According to Phelps, is there agreement among surgeons on the marginal benefit of appen- dectomies across these towns? Explain. [5] 3. Town F is added to the study and has a prevalence of appendectomies of 3.2%. Calculate the coefficient of variation for these 6 towns. [10] 4. Does this change your answer to b) above? [5]