American Chemical Society
Division of Chemical Education
Composite Norms
High School Chemistry Exam 2005
Score	Percentile	Score	Percentile	Score	Percentile
80	100	51	67	22	3
79	100	50	64	21	3
78	100	49	62	20	2
77	100	48	59	19	2
76	100	47	56	18	1
75	99	46	53	17	1
74	99	45	50	16	1
73	99	44	47	15	0
72	99	43	45	14	0
71	98	42	42	13	0
70	97	41	39	12	0
69	97	40	36	11	0
68	96	39	33	10	0
67	95	38	29	9	0
66	94	37	26	8	0
65	92	36	24	7	0
64	91	35	22	6	0
63	89	34	20	5	0
62	88	33	18	4	0
61	86	32	16	3	0
60	85	31	14	2	0
59	83	30	12	1	0
58	81	29	11	0	0
57	79	28	9
56	77	27	8
55	75	26	7
54	73	25	6
53	71	24	5
52	69	23	4
Mean		45.41
Std deviation		12.98
Median		44.6
KR-21 rel		0.89
Std error/meas		4.21