Here is the score distribution and curve for the first midterm.

Score	Grade	Number of tests

48-50	A+	29
43-47	A	29
38-42	A-	63
34-37	B+	63
31-33	B	70
28-30	B-	48
25-27	C+	47
22-24	C	53
19-21	C-	37
16-18	D+	30
13-15	D	17
10-12	D-	6
0-9	F	5