= An incoming MBA student took placement exams in economics and mathematics. In economics, she scored 84 and in math 85. The overall results on the economics exam had a mean of 75 and a standard deviation of 7, while the mean math score was 68, with a standard deviation of 10. On which exam did she do better compared with the other students? Since she scored standard deviations the mean in economics and standard deviations the mean in mathematics, she did better on the exam. (Round to two decimal places as needed.)