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

Score	Grade	Number of tests

58-60	A	73
55-57	A-	64
52-54	B+	36
49-51	B	27
46-48	B-	19
43-45	C+	20
40-42	C	12
37-39	C-	13
34-36	D+	7
31-33	D	5
28-30	D-	3
0-27	F	14