- Manuel and Omar began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Manuel took a test in Art History and earned a 74, and Omar took a test in Math and earned a 65.6. Use the fact that all the students' test grades in the Art History class had a mean of 74.6 and a standard deviation of 11.9, and all the students' test grades in Math had a mean of 64.8 and a standard deviation of 8.3 to answer the following questions. a) Calculate the zscore for Manuel's test grade. 2- b) Calculate the zscore for Omar's test grade. 2- c) Which person did relatively better? Manuel Omar '- They did equally well