percentage	course.work	fail	C	B	A
2.7	~5	91.2	8.8	0	0
4.6	5 ~ 10	79.7	20.3	0	0
18.1	10 ~ 15	53.9	35.7	10	0.4
33.9	15 ~ 20	13.3	45.1	34.9	6.7
30.6	20 ~ 25	0.3	12.6	60.3	26.8
10.1	25 ~ 30	0	0	14.7	85.3