QUESTIONS AND PROBLEMS At the end of a pa rticular quarter, Carol took four final exams. The mean a nd standard de viation for each exam a long with Carol's grade on each exam are listed here. Assume that the grades on each exam are normally distributed. Standard Carol's Exam Mean Deviation Grade French 75.4 6.3 78.2 History 85.6 4.1 83.4 Psychology 88.2 3.5 89.2 Statistics 70.4 8.6 82.5 a. On which exam did Carol do best, relative to the other students taking the exam? b. What w as her percentile r ank on t his exam? 15