An incoming MBA student took placement exams in economics and mathematics. In economics, she scored 82 and in math 90. The overall results on the economics exam had a mean of 71 and a standard deviation of 7, while the mean math score was 68, with a standard deviation of 11. 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.)