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Chelsea and Karissa began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Chelsea took a test in Art History and earned a 80.9, and Karissa took a test in Science and earned a 60.9. Use the fact that all the students' test grades in the Art History class had a mean of 74.4 and a standard deviation of 11.9, and all the students' test grades in Science had a mean of 65.6 and a standard deviation of 10.6 to answer the following questions. a) Calculate the z-score for Chelsea's test grade. 2 = [ Round your answer to two decimal places.] b) Calculate the z-score for Karissa's test grade. 2 = [ Round your answer to two decimal places.] c) Which person did relatively better? O Chelsea O Karissa O They did equally well. Add Work Check