Savannah and Jasmine began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Savannah took a test in Science and earned a 72.4, and Jasmine took a test in Art History and earned a 67.6. Use the fact that all the students' test grades in the Science class had a mean of 74.4 and a standard deviation of 10.5, and all the students' test grades in Art History had a mean of 66.9 and a standard deviation of 9 to answer the following questions.

a) Calculate the z-score for Savannah's test grade.

z=

b) Calculate the z-score for Jasmine's test grade.

z=

c) Which person did relatively better?

Savannah

Jasmine

They did equally well.