Jeff and Ryan began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Jeff took a test in Math and earned a 75, and Ryan took a test in Social Studies and earned a 71.6. Use the fact that all the students' test grades in the Math class had a mean of 70.4 and a standard deviation of 10.6, and all the students' test grades in Social Studies had a mean of 63.4 and a standard deviation of 10 to answer the following questions. a) Calculate the z-score for Jeff's test grade. b) Calculate the zscore for Ryan's test grade. :l