I have 2 writing assignments in class. The first assignment, which had a mean of 10 and a standard deviation of 2, I got a score of 12. The second assignment had a mean of 18 and an s.d. of 3, I got a 21. I need to know which assignment did I do better, relative to my classmates?

Graduate Level
Graduate Student

Hi Denise,

You need to use so-called Z-score for such problems.

First test Z-score = (12-10)/2 = 1,

Second test Z-score = (21-18)/3 = 1,
So you did none of the tests is better relative to your classmates.


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