stats
posted by Anonymous on .
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?

I assume the mean and SD are not negative.
Z = (scoremean)/SD
Insert values and solve for Z. 
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