



To adjust a set of scores I do the following: 
1. 
I determine the mean () for the class. 

2. 
I determine the standard deviation (s) for the class. 

3. 
I then compute a zscore for each student by taking that student's score, subtracting the mean and dividing the result by the standard deviation. (For any set of zscores the standard deviation will be 1 and the mean will be 0). 

4. 
I divide 20 by the highest zscore in the class in order to obtain the standard deviation for the curve and then multiply each zscore by the dividend and add 80. The resulting curved score is a modified Tscore. 