American Chemical Society
Division of Chemical Education
Composite Norms
Analytical Chemistry Exam 1988
Score	Percentile	Score	Percentile	Score	Percentile
50	100	33	98	16	24
49	100	32	96	15	19
48	100	31	93	14	14
47	100	30	91	13	10
46	100	29	89	12	6
45	100	28	85	11	4
44	100	27	82	10	2
43	100	26	79	9	1
42	100	25	74	8	0
41	100	24	70	7	0
40	100	23	64	6	0
39	100	22	59	5	0
38	100	21	53	4	0
37	100	20	47	3	0
36	99	19	41	2	0
35	98	18	34	1	0
34	98	17	30
Mean		20.93
Std deviation		6.3
Median		20.5
KR-21 rel		0.79
Std error/meas		3.41