American Chemical Society
Division of Chemical Education
Composite Norms
Diagnostic of Undergraduate Chemistry Knowledge 2008
Score	Percentile	Score	Percentile	Score	Percentile
60	100	40	84	20	10
59	100	39	81	19	9
58	100	38	77	18	7
57	100	37	74	17	5
56	100	36	70	16	3
55	100	35	66	15	2
54	100	34	61	14	1
53	100	33	57	13	1
52	99	32	52	12	1
51	99	31	47	11	0
50	99	30	42	10	0
49	98	29	38	9	0
48	98	28	34	8	0
47	97	27	30	7	0
46	96	26	26	6	0
45	95	25	23	5	0
44	94	24	19	4	0
43	92	23	16	3	0
42	89	22	14	2	0
41	87	21	12	1	0
Mean		31.49
Std deviation		8.37
Median		31.2
KR-21 rel		0.80
Std error/meas		3.75