The following is the score distribution for the second midterm with the
corresponding letter grades.

Score	Letter Grade	Number of Tests

51-60	A+		14
46-50	A		45
43-45	A-		23
40-42	B+		32
37-39	B		44
34-36	B-		37
31-33	C+		39
28-30	C		45
25-27	C-		31
22-24	D+		15
19-21	D		17
16-18	D-		14
0-15	F		28