Exam I approximate letter grades (out of 80)

Lowest number	Letter grade
76	A
71	A-
67	B+
63	B
60	B-
55	C+
50	C
45	C-
40	D

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Exam II approximate letter grades (out of 70)

Lowest number	Letter grade
65	A
63	A-
60	B+
56	B
53	B-
50	C+
45	C
40	C-
35	D

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Exam III approximate letter grades (out of 110)

Lowest number	Letter grade
100	A
93	A-
89	B+
85	B
80	B-
72	C+
60	C
55	C-
40	D

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