Fatoumata earned a score of 30 on Exam A that had a mean of 150 and a standard
deviation of 40. She is about to take Exam B that has a mean of 50 and a standard
deviation of 5. How well must Fatoumata score on Exam B in order to do equivalently
well as she did on Exam A? Assume that scores on each exam are normally
distributed.