Posted by **Anonymous** on Tuesday, November 29, 2011 at 11:12pm.

I scored an 85 percent on my exam. The mean score for that quiz was -83.73 and standard deviation was -24.23 what is the z score for this exam?

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**PsyDAG**, Wednesday, November 30, 2011 at 10:26am
I assume the mean and SD are not negative.

Z = (score-mean)/SD

Insert values and solve for Z.

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**Linda **, Wednesday, November 30, 2011 at 2:07pm
I'm a little confused on how to do it and then convert it into a percentage when I do work it out it comes to a huge number. I don't know to do anything after that . I get .31295738

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