Score distribution and curve for the first midterm:

Score     Letter grade   Number of Tests

48-50     A		   156
45-47     A-		   58
42-44     B+		   56
39-41     B		   58
36-38     B-		   34
33-35     C+		   28
30-32     C		   29
27-29     C-		   11
24-26     D+		   7
21-23     D		   6
18-20     D-		   11
0-17       F		   20