Sofia earned a score of 520 on Exam A that had a mean of 600 and a standard deviation of 40. She is about to take Exam B that has a mean of 400 and a standard deviation of 40. How well must Sofia 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.
+36915 520 is 2 standard deviations below the mean (600-520)/40=2
2 standard deviations below the mean for second tes would be 400- 2(40)=320
