Suppose in your English class, you earned a 70 on the first test (the class mean was 65 with SD = 3). In Math, you earned a 70 on the first test (the class mean was 65 with SD = 5). In Economics, you earned a 70 on the first test (the class mean was 65 with SD = 2). In which class did you do the best relative to the other students in the class?
A) English
B) Math
C) Economics
D) You did the same in all three classes relative to the other students.

Question

Quizplus · Accepted Answer

The z-score is calculated as (your score - mean) / standard deviation. The highest z-score indicates the best performance relative to the class. For Economics, the z-score is (70-65)/2 = 2.5, which is higher than the z-scores for English (1.67) and Math (1.0).

Suppose in Your English Class, You Earned a 70 on the First