Bell Curve- Normal Distribution?

You can use the FREQUENCY function to bin grades.

There are some methods discussed at http://en.wikipedia.org/wiki/Bell_curve_grading. Applying the method of adding to all students' absolute scores the difference between the top student's score and the max score gives this result for your data:

       ----A----- --B-- --C--- -----------D-----------
   1                     14.2% C1: =100% - MAX(B3:B24)
   2    Student    Raw   Adj                          
   3   Student 3  60.0%  74.2% C3 and down: =B3 + C$1 
   4   Student 22 66.2%  80.4%                        
   5   Student 6  71.0%  85.1%                        
   6   Student 18 75.2%  89.4%                        
   7   Student 20 75.6%  89.8%                        
   8   Student 4  75.6%  89.8%                        
   9   Student 21 76.3%  90.4%                        
  10   Student 12 78.2%  92.3%                        
  11   Student 14 78.4%  92.6%                        
  12   Student 10 78.7%  92.8%                        
  13   Student 19 78.8%  93.0%                        
  14   Student 16 78.9%  93.1%                        
  15   Student 7  79.6%  93.7%                        
  16   Student 11 79.7%  93.9%                        
  17   Student 13 79.9%  94.1%                        
  18   Student 15 79.9%  94.1%                        
  19   Student 8  80.0%  94.2%                        
  20   Student 17 80.2%  94.3%                        
  21   Student 5  80.4%  94.5%                        
  22   Student 9  80.7%  94.8%                        
  23   Student 2  82.2%  96.3%                        
  24   Student 1  85.8% 100.0%

See also http://www.astronomy.ohio-state.edu/...zes/curve.html