American Mathematics Competitions
2005 AMC 10 A Results for Oregon
GRAND STATISTICS
TOTAL NUMBER of official students taking exam: 534
Number of unofficial participants: 0
Average score of participants: 73.6
Average score for female students is: 71.3 ( 221 Students)
Average score for male students is: 75.4 ( 226 Students)
Average score for unspecified gender is 74.6 ( 87 Students)
Average score for grade 10 is: 72.3 ( 243 Students)
Average score for grade 9 is: 72.4 ( 182 Students)
Average score for grade 8 and below is: 84.6 ( 42 Students)
Average score with unknown grade: 74.7 ( 67 Students)
AIME qualifying score = 120.0 or better
Number of AIME qualifers 5
Number of schools returning results 23
Average school winning score 98.09
American Mathematics Competitions
2005 AMC 12 A Results for Oregon
GRAND STATISTICS
TOTAL NUMBER of official students taking exam: 808
Number of unofficial participants: 0
Average score of participants: 72.9
Average score for female students is: 70.1 ( 322 Students)
Average score for male students is: 75.6 ( 382 Students)
Average score for unspecified gender is 71.5 ( 104 Students)
Average score for grade 13 is: 78.0 ( 1 Student)
Average score for grade 12 is: 74.6 ( 341 Students)
Average score for grade 11 is: 70.7 ( 362 Students)
Average score for grade 10 is: 87.9 ( 21 Students)
Average score for grade 9 is: 76.3 ( 4 Students)
Average score with unknown grade: 70.9 ( 79 Students)
AIME qualifying score = 100.0 or better
Number of AIME qualifers 41
Number of schools returning results 23
Average school winning score 100.93
Average school team score 287.39
American Mathematics Competitions
2005 AMC 10 B Results for Oregon
GRAND STATISTICS
TOTAL NUMBER of official students taking exam: 1366
Number of unofficial participants: 0
Average score of participants: 74.9
Average score for female students is: 73.4 ( 646 Students)
Average score for male students is: 76.9 ( 612 Students)
Average score for unspecified gender is 72.0 ( 108 Students)
Average score for grade 12 is: 61.3 ( 3 Students)
Average score for grade 11 is: 72.8 ( 2 Students)
Average score for grade 10 is: 76.4 ( 631 Students)
Average score for grade 9 is: 72.4 ( 605 Students)
Average score for grade 8 and below is: 88.0 ( 36 Students)
Average score with unknown grade: 76.1 ( 89 Students)
AIME qualifying score = 120.0 or better
Number of AIME qualifers 2
Number of schools returning results 31
Average school winning score 106.06
American Mathematics Competitions
2005 AMC 12 B Results for Oregon
GRAND STATISTICS
TOTAL NUMBER of official students taking exam: 1535
Number of unofficial participants: 0
Average score of participants: 81.3
Average score for female students is: 79.5 ( 574 Students)
Average score for male students is: 82.7 ( 826 Students)
Average score for unspecified gender is 79.7 ( 135 Students)
Average score for grade 12 is: 83.6 ( 549 Students)
Average score for grade 11 is: 79.1 ( 718 Students)
Average score for grade 10 is: 82.8 ( 156 Students)
Average score for grade 9 is: 81.8 ( 40 Students)
Average score for grade 8 and below is: 91.3 ( 10 Students)
Average score with unknown grade: 79.7 ( 62 Students)
AIME qualifying score = 100.0 or better
Number of AIME qualifers 94
Number of schools returning results 31
Average school winning score 108.45
Average school team score 306.13
2005 State AMC 12 TEAM Score Distribution
-----------------------------------------------
score A B Rank
-----------------------------------------------
398.0 1 1
360.0 1 2
338.0 1 3
337.5 1 4
336.0 1 5
334.5 1 6
333.0 2 7
329.5 1 9
329.0 1 10
327.0 1 11
323.5 1 12
321.5 1 13
319.0 1 14
318.0 1 15
315.0 1 16
313.0 1 17
312.5 1 18
311.0 1 19
310.5 1 1 20
308.0 1 22
307.5 1 23
305.5 1 24
305.0 1 25
304.5 1 26
301.5 2 27
301.0 1 29
299.5 1 30
299.0 1 1 31
294.5 1 1 33
294.0 1 35
292.0 1 36
289.0 1 37
287.5 1 38
286.5 1 39
285.5 1 40
284.5 1 41
284.0 1 42
277.5 1 43
272.0 1 44
270.5 2 45
268.5 1 47
266.5 1 48
261.0 1 49
234.0 1 50
230.0 1 51
220.0 1 52
205.5 1 53
190.0 1 54
2005 AMC Contest Score Distributions
-----------------------------------------------
score 12 A 12 B 10 A 10 B
-----------------------------------------------
143.0 1 1
133.5 1
127.5 2
125.5 2
124.0 2
123.0 2 1
122.0 1
121.5 1
120.5 1
119.5 1 1
118.5 2 1
118.0 1
116.0 3 1
115.0 1 1 1
114.5 3 1
113.5 2 1 6
113.0 1
112.5 1 3 1
112.0 1 1
111.5 3 1 1
111.0 1 2
110.0 1 5
109.5 1
109.0 1 3 3
108.5 1
108.0 1 2 2 1
107.5 1 4
106.5 3 2 1 3
106.0 2 1
105.5 4 11 2 2
105.0 2 1
104.5 3 10 6
104.0 1 2 2 2
103.0 3 7 6
102.5 2 2
102.0 7 12 1 7
101.5 1 1 2
101.0 8 17 3 3
100.5 3 6 3 3
100.0 1
99.5 8 7 1 7
99.0 1 2 2
98.5 10 28 3 7
98.0 4 5
97.5 6 14 2 2
97.0 2 13 5 9
96.5 1 1
96.0 9 28 1 18
95.5 1 3 1 8
95.0 14 56 4 17
94.5 6 8 2 14
94.0 2 11 3 6
93.5 5 15 8 10
93.0 1 1
92.5 11 40 1 14
92.0 3 4 2 7
91.5 10 32 5 18
91.0 3 14 2 7
90.5 5 16 2 9
90.0 9 17 3 11
89.5 1 1 2
89.0 17 69 5 17
88.5 3 6 2 9
88.0 9 40 6 18
87.5 4 17 1 16
87.0 8 19 1 6
86.5 7 43 13 21
86.0 1 2 2 3
85.5 13 32 10 31
85.0 6 9 3 4
84.5 4 34 6 16
84.0 11 22 2 9
83.5 10 14 3 5
83.0 12 54 3 19
82.5 3 2 3 8
82.0 10 27 8 23
81.5 8 17 2 8
81.0 15 35 7 13
80.5 13 22 8 23
80.0 4 17 5 12
79.5 5 31 11 36
79.0 6 10 2 14
78.5 13 43 8 19
78.0 10 14 4 12
77.5 10 23 7 14
77.0 9 37 7 17
76.5 8 15 1 8
76.0 18 30 12 27
75.5 3 4 5 5
75.0 9 18 11 26
74.5 11 25 9 19
74.0 11 12 7 14
73.5 10 25 7 22
73.0 4 10 3 13
72.5 13 11 9 40
72.0 5 14 4 16
71.5 9 10 8 16
71.0 10 23 11 21
70.5 10 10 6 12
70.0 12 18 4 22
69.5 1 12 7 15
69.0 7 16 11 10
68.5 13 5 5 12
68.0 12 6 8 21
67.5 11 11 7 18
67.0 4 6 4 9
66.5 5 10 6 25
66.0 11 17 7 18
65.5 10 2 5 9
65.0 9 12 8 13
64.5 6 6 2 8
64.0 9 5 6 21
63.5 8 10 6 8
63.0 9 3 8 10
62.5 4 7 8 17
62.0 4 7 4 15
61.5 8 7 9 12
61.0 5 7 2 10
60.5 8 4 1 10
60.0 9 11 6 19
59.5 4 5 4 11
59.0 6 7 3 10
58.5 3 3 4 7
58.0 7 5 6 9
57.5 1 6 2 4
57.0 5 4 6 11
56.5 3 6 5 8
56.0 4 4 2 6
55.5 4 4 7
55.0 3 6 1
54.5 5 2 2 7
54.0 7 4 6 9
53.5 6 2 1 6
53.0 2 4 2 5
52.5 1 8 7
52.0 4 1 4
51.5 2 3 1 2
51.0 3 2 1 4
50.5 3 3 5
50.0 5 3 8
49.5 3 1 2 3
49.0 2 1 4
48.5 2 2 5
48.0 9 5 3 4
47.5 1 3
47.0 3 1 1 2
46.5 1 1
46.0 2 2 2 4
45.5 3 2
45.0 1 3
44.5 2 2 2
44.0 1 1
43.5 1 1
43.0 1 1 2
42.5 1 1
42.0 8 4 2 7
41.5 1 2
41.0 1 3 2
40.5 1 3
40.0 1
39.5 1 2
39.0 1
38.5 1 2
38.0 3
37.5 1 1 1
37.0 1 1 1 2
36.5 1 1
36.0 15 4 1 4
35.5 1
35.0 1 1 1
34.5 1 1
33.0 1
32.5 3 1 1
32.0 1
31.5 1
30.5 1 1
30.0 9 4 1 2
29.5 1 1
29.0 2
28.5 2
26.0 1
24.0 5 1 1 2
23.0 1 1
22.0 1
20.0 1
18.0 5 3
14.5 1
12.0 1 1 1
6.0 3
American Mathematics Competitions
2005 AMC 10 A Results for Oregon
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
150.0 125.0 100.0
149.5 124.5 99.5 1
149.0 124.0 1 99.0 2
148.5 123.5 98.5 1 1
148.0 123.0 1 98.0
147.5 122.5 97.5 1
147.0 122.0 97.0 3 2
146.5 121.5 1 96.5 1
146.0 121.0 96.0 1
145.5 120.5 95.5 1
145.0 120.0 95.0 2 1
144.5 119.5 94.5 1 1
144.0 119.0 94.0 2 1
143.5 118.5 93.5 4 3
143.0 1 118.0 93.0 1
142.5 117.5 92.5
142.0 117.0 92.0 1 1
141.5 116.5 91.5 2 3
141.0 116.0 91.0 2
140.5 115.5 90.5 1 1
140.0 115.0 1 90.0 2 1
139.5 114.5 1 89.5
139.0 114.0 89.0 2 3
138.5 113.5 1 88.5 1
138.0 113.0 88.0 3 2
137.5 112.5 1 87.5 1
137.0 112.0 1 87.0 1
136.5 111.5 1 86.5 8 3
136.0 111.0 86.0 1
135.5 110.5 85.5 5 4
135.0 110.0 1 85.0 3
134.5 109.5 84.5 3 3
134.0 109.0 84.0 1
133.5 108.5 83.5 1 1
133.0 108.0 2 83.0 2 1
132.5 107.5 82.5 2
132.0 107.0 82.0 2 5
131.5 106.5 81.5 2
131.0 106.0 1 81.0 1 5
130.5 105.5 1 1 80.5 4 4
130.0 105.0 1 80.0 1 1
129.5 104.5 79.5 3 6
129.0 104.0 2 79.0 1 1
128.5 103.5 78.5 4 4
128.0 103.0 78.0 2 2
127.5 102.5 2 77.5 2 4
127.0 102.0 1 77.0 3 1
126.5 101.5 76.5
126.0 101.0 3 76.0 3 5
125.5 100.5 1 1 75.5 2 2
American Mathematics Competitions
2005 AMC 10 A Results for Oregon
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
75.0 3 6 50.0 25.0
74.5 5 3 49.5 1 1 24.5
74.0 4 2 49.0 2 1 24.0 1
73.5 7 48.5 1 1 23.5
73.0 2 1 48.0 3 23.0 1
72.5 1 6 47.5 22.5
72.0 2 47.0 1 22.0 1
71.5 2 4 46.5 21.5
71.0 5 4 46.0 1 21.0
70.5 2 4 45.5 2 20.5
70.0 3 1 45.0 20.0
69.5 3 3 44.5 19.5
69.0 5 5 44.0 19.0
68.5 4 1 43.5 18.5
68.0 6 1 43.0 1 18.0
67.5 2 3 42.5 1 17.5
67.0 1 3 42.0 1 17.0
66.5 2 4 41.5 1 16.5
66.0 2 2 41.0 16.0
65.5 1 1 40.5 1 15.5
65.0 6 2 40.0 15.0
64.5 2 39.5 14.5
64.0 1 5 39.0 14.0
63.5 2 3 38.5 2 13.5
63.0 2 5 38.0 13.0
62.5 3 3 37.5 1 12.5
62.0 1 2 37.0 12.0 1
61.5 5 3 36.5 11.5
61.0 1 36.0 11.0
60.5 35.5 10.5
60.0 3 2 35.0 1 10.0
59.5 4 34.5 9.5
59.0 2 1 34.0 9.0
58.5 1 2 33.5 8.5
58.0 3 1 33.0 8.0
57.5 1 1 32.5 1 7.5
57.0 4 1 32.0 7.0
56.5 5 31.5 6.5
56.0 1 31.0 6.0
55.5 3 1 30.5 1 5.5
55.0 2 2 30.0 1 5.0
54.5 1 1 29.5 1 4.5
54.0 4 2 29.0 4.0
53.5 1 28.5 3.5
53.0 2 28.0 3.0
52.5 3 3 27.5 2.5
52.0 27.0 2.0
51.5 1 26.5 1.5
51.0 1 26.0 1.0
50.5 1 2 25.5 .5
0.0 0 0
American Mathematics Competitions
2005 AMC 10 A Results for Oregon
SCORE DISTRIBUTION
score -----------grade-----------
6 7 8 9 10 unknown
---------------------------
143.0 1
124.0 1 1
123.0 1
121.5 1
119.5 1
115.0 1
114.5 1 2
113.5 1
113.0 1
112.5 1
112.0 1
111.5 1
110.0 1
108.0 2
106.5 1
106.0 1 1
105.5 2
105.0 1 1
104.0 2
102.5 2
102.0 1
101.0 1 2
100.5 1 1 1
99.5 1
99.0 1 1
98.5 1 2
97.5 1 1
97.0 1 2 2
96.5 1
96.0 1
95.5 1
95.0 2 2
94.5 1 1
94.0 1 2
93.5 1 3 4
93.0 1
92.5 1
92.0 2
91.5 2 3
91.0 2
90.5 1 1
90.0 3
89.0 3 2
88.5 1 1
88.0 1 2 2 1
87.5 1
87.0 1
86.5 3 3 6 1
86.0 1 1
85.5 1 1 1 2 4 1
85.0 3
84.5 1 5
84.0 1 1
83.5 2 1
83.0 3
82.5 1 2
82.0 2 3 2 1
81.5 1 1
81.0 1 4 1 1
80.5 1 7
80.0 2 3
79.5 1 4 4 2
79.0 1 1
78.5 1 4 3
78.0 1 2 1
77.5 3 3 1
77.0 1 2 2 2
76.5 1
76.0 6 2 4
75.5 1 3 1
75.0 6 5
74.5 5 3 1
74.0 3 3 1
73.5 4 3
73.0 1 2
72.5 3 2 3 1
72.0 3 1
71.5 3 4 1
71.0 4 5 2
70.5 2 4
70.0 1 3
69.5 1 1 4 1
69.0 5 6
68.5 4 1
68.0 4 3 1
67.5 1 1 2 3
67.0 1 3
66.5 5 1
66.0 2 2 3
65.5 2 2 1
65.0 1 6 1
64.5 2
64.0 3 3
63.5 2 3 1
63.0 4 3 1
62.5 1 1 3 2 1
62.0 2 2
61.5 1 3 4 1
61.0 1 1
60.5 1
60.0 1 1 1 2 1
59.5 1 3
59.0 2 1
58.5 2 1 1
58.0 1 3 2
57.5 2
57.0 3 3
56.5 1 2 2
56.0 1 1
55.5 1 3
55.0 4 2
54.5 2
54.0 4 2
53.5 1
53.0 2
52.5 2 5 1
51.5 1
51.0 1
50.5 3
49.5 1 1
49.0 2 1 1
48.5 2
48.0 3
47.0 1
46.0 1 1
45.5 1 1
43.0 1
42.5 1
42.0 1 1
41.5 1
40.5 1
38.5 2
37.5 1
37.0 1
36.5 1
36.0 1
35.0 1
32.5 1
30.5 1
30.0 1
29.5 1
24.0 1
23.0 1
22.0 1
12.0 1
American Mathematics Competitions
2005 AMC 10 A Results for Oregon
Analysis
Table of Item Difficulty for the 2005
American High School Mathematics Examination
Tabulation of responses for all Participants
Percent of Responses
ITEM A B C D E OMITS ?
____ _____ _____ _____ _____ _____ _____ _____
1 0.19 0.11 0.22 8.86* 0.36 0.24 0.02
2 0.11 0.21 4.96* 0.07 1.76 2.88 0.00
3 0.06 8.86* 0.19 0.32 0.11 0.47 0.00
4 0.43 1.70* 1.54 0.67 0.60 5.06 0.00
5 5.82* 0.47 3.41 0.11 0.04 0.15 0.00
6 0.32 5.56* 2.81 0.19 0.06 1.07 0.00
7 0.52 3.60* 0.28 0.34 0.86 4.40 0.00
8 1.24 0.13 4.12* 0.09 0.07 4.34 0.00
9 1.22 5.67* 1.09 0.28 0.17 1.57 0.00
10 1.25* 0.19 0.97 0.36 0.09 7.13 0.00
11 0.43 2.40* 0.28 0.82 0.13 5.94 0.00
12 0.30 1.48* 0.34 0.34 0.52 7.02 0.00
13 1.40 0.37 0.36 0.30 0.97* 6.59 0.00
14 0.88 0.47 0.37 0.43 2.00* 5.84 0.00
15 0.34 0.86 0.73 1.03 0.60* 6.44 0.00
16 0.49 0.32 0.81 1.59* 0.13 6.67 0.00
17 0.21 0.21 0.51 2.00* 0.34 6.74 0.00
18 1.31* 1.91 1.12 2.96 0.26 2.42 0.02
19 0.34 0.54 0.58 3.01* 0.71 4.81 0.00
20 0.34* 0.34 0.56 0.36 0.36 8.05 0.00
21 1.48 0.49* 0.17 0.19 0.52 7.15 0.00
22 0.62 0.37 0.30 1.82* 0.52 6.37 0.00
23 0.17 0.36 1.09* 0.75 0.66 6.99 0.00
24 0.86 0.73* 0.17 0.15 0.02 8.07 0.00
25 0.26 0.54 0.77 0.73* 0.09 7.60 0.00
(*) Correct Response
(?) Response the computer was unable to read due to incomplete
erasures or two answers marked in the same column
American Mathematics Competitions
2005 AMC 12 A Results for Oregon
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
150.0 125.0 100.0
149.5 124.5 99.5 4 3
149.0 124.0 99.0
148.5 123.5 98.5 7 2
148.0 123.0 98.0
147.5 122.5 97.5 1 4
147.0 122.0 97.0 2
146.5 121.5 96.5
146.0 121.0 96.0 5 3
145.5 120.5 95.5 1
145.0 120.0 95.0 4 6
144.5 119.5 94.5 4 2
144.0 119.0 94.0 2
143.5 118.5 93.5 4
143.0 1 118.0 93.0
142.5 117.5 92.5 7 4
142.0 117.0 92.0 2 1
141.5 116.5 91.5 5 3
141.0 116.0 91.0 2 1
140.5 115.5 90.5 3 2
140.0 115.0 1 90.0 6 2
139.5 114.5 89.5 1
139.0 114.0 89.0 8 7
138.5 113.5 88.5 3
138.0 113.0 88.0 3 3
137.5 112.5 1 87.5 1 2
137.0 112.0 87.0 3 5
136.5 111.5 86.5 3 3
136.0 111.0 86.0 1
135.5 110.5 85.5 7 3
135.0 110.0 85.0 4 1
134.5 109.5 84.5 2 2
134.0 109.0 1 84.0 6 5
133.5 1 108.5 83.5 3 5
133.0 108.0 1 83.0 6 3
132.5 107.5 82.5 3
132.0 107.0 82.0 3 7
131.5 106.5 2 1 81.5 5 1
131.0 106.0 81.0 4 10
130.5 105.5 2 1 80.5 8 4
130.0 105.0 80.0 3 1
129.5 104.5 3 79.5 2 2
129.0 104.0 1 79.0 2 3
128.5 103.5 78.5 8 5
128.0 103.0 2 1 78.0 6 3
127.5 2 102.5 77.5 6 4
127.0 102.0 5 2 77.0 5 2
126.5 101.5 1 76.5 7
126.0 101.0 4 4 76.0 12 4
125.5 100.5 3 75.5 2 1
American Mathematics Competitions
2005 AMC 12 A Results for Oregon
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
75.0 3 2 50.0 2 3 25.0
74.5 4 6 49.5 1 1 24.5
74.0 4 7 49.0 2 24.0 4
73.5 6 3 48.5 23.5
73.0 1 48.0 7 2 23.0 1
72.5 7 4 47.5 22.5
72.0 3 1 47.0 3 22.0
71.5 3 2 46.5 21.5
71.0 6 2 46.0 1 1 21.0
70.5 5 5 45.5 1 2 20.5
70.0 5 5 45.0 20.0 1
69.5 44.5 1 1 19.5
69.0 1 4 44.0 1 19.0
68.5 7 4 43.5 1 18.5
68.0 4 4 43.0 18.0 3 2
67.5 5 4 42.5 17.5
67.0 3 1 42.0 4 4 17.0
66.5 2 3 41.5 16.5
66.0 9 2 41.0 16.0
65.5 5 4 40.5 15.5
65.0 3 3 40.0 1 15.0
64.5 5 1 39.5 14.5
64.0 5 4 39.0 1 14.0
63.5 4 3 38.5 13.5
63.0 6 3 38.0 13.0
62.5 4 37.5 12.5
62.0 2 2 37.0 1 12.0 1
61.5 3 3 36.5 1 11.5
61.0 3 1 36.0 4 9 11.0
60.5 2 4 35.5 10.5
60.0 3 5 35.0 1 10.0
59.5 2 2 34.5 1 9.5
59.0 1 4 34.0 9.0
58.5 1 2 33.5 8.5
58.0 2 4 33.0 8.0
57.5 1 32.5 2 1 7.5
57.0 1 2 32.0 7.0
56.5 2 31.5 6.5
56.0 2 2 31.0 6.0 2
55.5 2 2 30.5 5.5
55.0 2 1 30.0 3 4 5.0
54.5 4 29.5 4.5
54.0 1 4 29.0 4.0
53.5 2 3 28.5 3.5
53.0 1 28.0 3.0
52.5 1 27.5 2.5
52.0 1 3 27.0 2.0
51.5 2 26.5 1.5
51.0 3 26.0 1.0
50.5 1 2 25.5 .5
0.0 0 0
American Mathematics Competitions
2005 AMC 12 A Results for Oregon
SCORE DISTRIBUTION
score -----------grade-----------
6 7 8 9 10 11 12 13 unknown
---------------------------
143.0 1
133.5 1
127.5 2
115.0 1
112.5 1
109.0 1
108.0 1
106.5 2 1
105.5 1 2 1
104.5 2 1
104.0 1
103.0 2 1
102.0 4 3
101.5 1
101.0 1 7
100.5 2 1
99.5 3 4 1
99.0 1
98.5 2 8
97.5 3 2 1
97.0 1 1
96.0 1 7 1
95.5 1
95.0 4 7 3
94.5 1 3 2
94.0 1 1
93.5 1 2 1 1
92.5 1 10
92.0 2 1
91.5 3 6 1
91.0 3
90.5 1 1 3
90.0 5 3 1
89.5 1
89.0 1 6 10
88.5 3
88.0 2 4 3
87.5 3 1
87.0 4 4
86.5 2 4 1
86.0 1
85.5 1 6 4 2
85.0 3 3
84.5 2 2
84.0 6 5
83.5 4 5 1
83.0 5 6 1
82.5 1 2
82.0 2 8
81.5 1 4 2 1
81.0 8 6 1
80.5 2 6 4 1
80.0 3 1
79.5 1 2 2
79.0 5 1
78.5 6 7
78.0 4 4 1 1
77.5 8 2
77.0 5 2 2
76.5 2 5 1
76.0 12 5 1
75.5 2 1
75.0 2 3 4
74.5 5 5 1
74.0 1 4 6
73.5 8 2
73.0 1 3
72.5 7 3 3
72.0 2 2 1
71.5 1 5 3
71.0 5 4 1
70.5 6 4
70.0 4 5 3
69.5 1
69.0 3 3 1
68.5 1 7 3 2
68.0 4 5 3
67.5 1 5 4 1
67.0 1 3
66.5 2 3
66.0 7 4
65.5 4 5 1
65.0 1 3 3 2
64.5 2 4
64.0 5 4
63.5 1 3 3 1
63.0 6 3
62.5 1 3
62.0 3 1
61.5 5 1 2
61.0 2 2 1
60.5 2 3 3
60.0 4 4 1
59.5 2 2
59.0 4 1 1
58.5 2 1
58.0 5 1 1
57.5 1
57.0 1 2 2
56.5 2 1
56.0 2 2
55.5 2 2
55.0 1 2
54.5 3 1 1
54.0 2 3 1 1
53.5 2 3 1
53.0 1 1
52.5 1
52.0 1 3
51.5 2
51.0 3
50.5 1 2
50.0 3 1 1
49.5 2 1
49.0 1 1
48.0 6 3
47.0 1 2
46.0 1 1
45.5 2 1
44.5 1 1
44.0 1
43.5 1
42.0 3 5
41.0 1
40.0 1
39.5 1
39.0 1
37.0 1
36.5 1
36.0 10 3 2
35.0 1
34.5 1
32.5 3
31.5 1
30.0 4 5
24.0 4 1
23.0 1
20.0 1
18.0 2 3
12.0 1
6.0 1 1 1
American Mathematics Competitions
2005 AMC 12 A Results for Oregon
Analysis
Table of Item Difficulty for the 2005
American High School Mathematics Examination
Tabulation of responses for all Participants
Percent of Responses
ITEM A B C D E OMITS ?
____ _____ _____ _____ _____ _____ _____ _____
1 0.14 0.11 0.27 9.11* 0.12 0.25 0.00
2 0.02 9.06* 0.35 0.40 0.11 0.06 0.00
3 0.43 2.97* 1.75 0.56 0.47 3.82 0.00
4 6.19* 0.46 3.09 0.09 0.07 0.09 0.01
5 0.27 6.45* 2.35 0.10 0.11 0.72 0.00
6 0.75 4.83* 0.37 0.42 0.90 2.71 0.01
7 0.84 0.36 6.21* 0.22 0.17 2.19 0.00
8 0.64 0.74 0.41 1.66* 0.47 6.08 0.00
9 2.57* 0.62 1.16 0.62 0.20 4.83 0.00
10 0.67 2.93* 0.40 0.54 0.14 5.32 0.00
11 0.97 0.62 0.50 0.48 3.04* 4.37 0.02
12 1.40 0.46 0.35 2.51* 1.39 3.90 0.00
13 0.32 0.26 0.61 2.98* 0.33 5.50 0.00
14 0.41 0.52 3.51 0.92* 0.47 4.17 0.00
15 0.30 0.61 1.39* 1.00 0.63 6.08 0.00
16 0.40 0.52 0.71 0.61* 0.48 7.29 0.00
17 1.52* 1.20 1.37 0.46 0.47 4.98 0.00
18 0.35* 0.40 0.36 0.42 0.38 8.09 0.00
19 0.94 1.71* 0.99 0.54 0.92 4.90 0.00
20 0.50 0.37 0.36 0.30 0.30* 8.18 0.00
21 0.42 0.47 0.41* 0.31 0.14 8.25 0.00
22 0.50 0.47* 0.35 0.36 0.24 8.09 0.00
23 0.42 0.51* 0.36 0.27 0.48 7.95 0.01
24 0.17 0.28* 0.32 0.28 0.11 8.82 0.00
25 0.48 0.33 0.36* 0.24 0.12 8.47 0.00
(*) Correct Response
(?) Response the computer was unable to read due to incomplete
erasures or two answers marked in the same column
American Mathematics Competitions
2005 AMC 10 B Results for Oregon
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
150.0 125.0 100.0 1
149.5 124.5 99.5 4 3
149.0 124.0 99.0 2
148.5 123.5 98.5 2 5
148.0 123.0 98.0 3 1
147.5 122.5 97.5 1
147.0 122.0 1 97.0 6 3
146.5 121.5 96.5 1
146.0 121.0 96.0 10 7
145.5 120.5 1 95.5 5 3
145.0 120.0 95.0 8 9
144.5 119.5 1 94.5 6 8
144.0 119.0 94.0 3 3
143.5 118.5 1 93.5 4 5
143.0 118.0 93.0 1
142.5 117.5 92.5 8 4
142.0 117.0 92.0 5 1
141.5 116.5 91.5 8 8
141.0 116.0 1 91.0 3 4
140.5 115.5 90.5 5 4
140.0 115.0 90.0 4 6
139.5 114.5 1 89.5 2
139.0 114.0 89.0 9 7
138.5 113.5 4 1 88.5 4 4
138.0 113.0 88.0 10 7
137.5 112.5 87.5 10 5
137.0 112.0 1 87.0 1 4
136.5 111.5 1 86.5 12 7
136.0 111.0 1 1 86.0 1 1
135.5 110.5 85.5 8 21
135.0 110.0 5 85.0 3 1
134.5 109.5 1 84.5 5 11
134.0 109.0 3 84.0 2 6
133.5 108.5 1 83.5 3 2
133.0 108.0 83.0 6 11
132.5 107.5 2 2 82.5 6 2
132.0 107.0 82.0 10 11
131.5 106.5 2 1 81.5 5 2
131.0 106.0 1 81.0 5 6
130.5 105.5 2 80.5 17 6
130.0 105.0 1 80.0 6 4
129.5 104.5 3 3 79.5 14 16
129.0 104.0 2 79.0 6 8
128.5 103.5 78.5 8 7
128.0 103.0 3 2 78.0 5 5
127.5 102.5 2 77.5 6 8
127.0 102.0 5 2 77.0 9 8
126.5 101.5 1 1 76.5 4 4
126.0 101.0 1 2 76.0 10 14
125.5 100.5 2 75.5 2 1
American Mathematics Competitions
2005 AMC 10 B Results for Oregon
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
75.0 13 12 50.0 2 5 25.0
74.5 10 9 49.5 1 2 24.5
74.0 6 8 49.0 24.0 2
73.5 16 6 48.5 2 23.5
73.0 3 8 48.0 3 1 23.0
72.5 19 20 47.5 1 22.5
72.0 7 7 47.0 1 1 22.0
71.5 6 10 46.5 1 21.5
71.0 12 9 46.0 2 2 21.0
70.5 4 6 45.5 20.5
70.0 8 13 45.0 1 2 20.0
69.5 8 7 44.5 1 19.5
69.0 3 6 44.0 1 19.0
68.5 7 5 43.5 18.5
68.0 7 9 43.0 1 1 18.0 1 2
67.5 10 8 42.5 1 17.5
67.0 3 6 42.0 5 17.0
66.5 8 14 41.5 1 1 16.5
66.0 5 9 41.0 2 16.0
65.5 5 3 40.5 3 15.5
65.0 4 9 40.0 15.0
64.5 3 5 39.5 2 14.5 1
64.0 10 8 39.0 14.0
63.5 2 3 38.5 13.5
63.0 4 4 38.0 1 2 13.0
62.5 7 9 37.5 1 12.5
62.0 3 12 37.0 2 12.0 1
61.5 5 7 36.5 11.5
61.0 6 4 36.0 1 2 11.0
60.5 3 6 35.5 1 10.5
60.0 7 12 35.0 10.0
59.5 5 5 34.5 9.5
59.0 6 4 34.0 9.0
58.5 5 2 33.5 8.5
58.0 2 5 33.0 1 8.0
57.5 2 2 32.5 7.5
57.0 1 8 32.0 1 7.0
56.5 7 31.5 6.5
56.0 2 3 31.0 6.0
55.5 1 5 30.5 1 5.5
55.0 1 30.0 1 1 5.0
54.5 2 3 29.5 1 4.5
54.0 2 6 29.0 1 4.0
53.5 4 2 28.5 1 1 3.5
53.0 1 4 28.0 3.0
52.5 4 3 27.5 2.5
52.0 4 27.0 2.0
51.5 2 26.5 1.5
51.0 2 1 26.0 1.0
50.5 3 2 25.5 .5
0.0 0 0
American Mathematics Competitions
2005 AMC 10 B Results for Oregon
SCORE DISTRIBUTION
score -----------grade-----------
6 7 8 9 10 unknown
---------------------------
122.0 1
120.5 1
119.5 1
118.5 1
116.0 1
114.5 1
113.5 4 2
112.0 1
111.5 1
111.0 1 1
110.0 4 1
109.5 1
109.0 3
108.5 1
108.0 1
107.5 1 3
106.5 1 2
106.0 1
105.5 2
105.0 1
104.5 1 2 2 1
104.0 2
103.0 5 1
102.5 1 1
102.0 1 2 3 1
101.5 2
101.0 3
100.5 1 1 1
100.0 1
99.5 1 2 4
99.0 1 1
98.5 1 1 5
98.0 2 1 1
97.5 2
97.0 1 2 5 1
96.5 1
96.0 3 14 1
95.5 1 1 4 2
95.0 2 3 12
94.5 4 8 2
94.0 1 5
93.5 1 4 5
93.0 1
92.5 1 5 4 4
92.0 2 3 2
91.5 2 9 6 1
91.0 4 2 1
90.5 1 3 5
90.0 4 7
89.5 1 1
89.0 2 8 7
88.5 2 6 1
88.0 3 15
87.5 2 8 2 4
87.0 4 1 1
86.5 2 12 6 1
86.0 1 1 1
85.5 12 17 2
85.0 1 2 1
84.5 7 8 1
84.0 3 6
83.5 3 2
83.0 12 6 1
82.5 3 5
82.0 9 14
81.5 2 4 2
81.0 5 8
80.5 11 10 2
80.0 5 5 2
79.5 20 15 1
79.0 4 10
78.5 7 11 1
78.0 1 4 6 1
77.5 6 7 1
77.0 12 5
76.5 5 3
76.0 1 12 13 1
75.5 3 1 1
75.0 15 10 1
74.5 1 11 5 1
74.0 7 7
73.5 14 8
73.0 1 6 5 1
72.5 21 16 3
72.0 6 9 1
71.5 12 4
71.0 1 7 12
70.5 7 4 1
70.0 12 9 1
69.5 8 7
69.0 4 6
68.5 4 8
68.0 1 10 8 2
67.5 9 9
67.0 3 5 1
66.5 10 11 4
66.0 1 4 11 2
65.5 3 5 1
65.0 5 6 2
64.5 1 2 4 1
64.0 12 5 4
63.5 5 2 1
63.0 7 2 1
62.5 6 10 1
62.0 1 7 7
61.5 8 4
61.0 5 4 1
60.5 7 3
60.0 11 8
59.5 9 2
59.0 6 4
58.5 5 2
58.0 5 3 1
57.5 2 2
57.0 4 6 1
56.5 1 3 3 1
56.0 2 4
55.5 1 5 1
55.0 1
54.5 2 4 1
54.0 6 3
53.5 3 3
53.0 2 3
52.5 3 4
52.0 3 1
51.5 2
51.0 1 3
50.5 3 2
50.0 3 4
49.5 2 1
48.5 2 2 1
48.0 1 3
47.5 2 1
47.0 1 1
46.5 1
46.0 2 1 1
45.0 3
44.5 1 1
44.0 1
43.0 2
42.5 1
42.0 2 4 1
41.5 1 1
41.0 1 1
40.5 1 2
39.5 1 1
38.0 2 1
37.5 1
37.0 2
36.0 1 2
35.5 1
33.0 1
32.0 1
30.5 1
30.0 2
29.5 1
29.0 1 1
28.5 1 1
26.0 1
24.0 2
18.0 3
14.5 1
12.0 1
American Mathematics Competitions
2005 AMC 10 B Results for Oregon
Analysis
Table of Item Difficulty for the 2005
American High School Mathematics Examination
Tabulation of responses for all Participants
Percent of Responses
ITEM A B C D E OMITS ?
____ _____ _____ _____ _____ _____ _____ _____
1 8.30* 0.27 0.50 0.26 0.49 0.18 0.00
2 0.10 0.35 0.13 7.47* 0.33 1.63 0.00
3 0.05 0.80 2.13 5.29* 0.98 0.75 0.00
4 0.98 0.06 0.72 2.75* 0.13 5.35 0.00
5 0.16 0.10 8.18* 0.15 0.57 0.83 0.00
6 0.17 7.77* 0.31 0.34 0.24 1.17 0.00
7 0.59 0.97* 0.31 0.94 0.48 6.71 0.00
8 5.01* 0.24 0.79 0.07 0.07 3.81 0.00
9 0.51 0.62 2.28 4.31* 0.52 1.76 0.00
10 1.05* 0.73 0.48 0.34 0.28 7.12 0.00
11 0.27 0.38 0.20 1.39 1.35* 6.40 0.00
12 0.42 1.25 0.35 0.20 0.12* 7.65 0.00
13 0.34 0.34 1.34* 1.44 0.31 6.22 0.00
14 0.42 0.24 1.41* 1.65 0.34 5.94 0.00
15 1.15 0.57 0.59 3.90* 0.59 3.20 0.01
16 0.29 0.45 0.45 0.21* 0.03 8.56 0.00
17 0.45 1.93* 1.08 0.27 0.14 6.13 0.00
18 0.43 4.75 0.79 1.60* 0.49 1.94 0.00
19 0.44 4.74* 0.38 0.46 0.36 3.62 0.00
20 0.56 0.28 0.67* 0.29 0.16 8.05 0.00
21 0.17* 0.24 0.25 0.19 0.10 9.06 0.00
22 0.45 0.67 0.20* 0.23 0.14 8.31 0.00
23 2.04 0.38 0.28* 0.23 0.18 6.90 0.00
24 0.26 0.14 0.17 0.29 0.57* 8.57 0.00
25 0.23 0.26 2.37* 0.20 0.10 6.85 0.00
(*) Correct Response
(?) Response the computer was unable to read due to incomplete
erasures or two answers marked in the same column
American Mathematics Competitions
2005 AMC 12 B Results for Oregon
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
150.0 125.0 100.0
149.5 124.5 99.5 2 2
149.0 124.0 99.0
148.5 123.5 98.5 17 9
148.0 123.0 1 1 98.0 2 2
147.5 122.5 97.5 9 5
147.0 122.0 97.0 10 2
146.5 121.5 96.5
146.0 121.0 96.0 16 11
145.5 120.5 95.5 3
145.0 120.0 95.0 34 17
144.5 119.5 94.5 6 1
144.0 119.0 94.0 9 2
143.5 118.5 2 93.5 8 7
143.0 118.0 1 93.0
142.5 117.5 92.5 23 13
142.0 117.0 92.0 4
141.5 116.5 91.5 15 13
141.0 116.0 3 91.0 9 5
140.5 115.5 90.5 7 7
140.0 115.0 1 90.0 11 5
139.5 114.5 89.5 1
139.0 114.0 89.0 36 26
138.5 113.5 2 88.5 5 1
138.0 113.0 88.0 16 21
137.5 112.5 3 87.5 12 3
137.0 112.0 87.0 11 7
136.5 111.5 3 86.5 26 14
136.0 111.0 86.0 1
135.5 110.5 85.5 12 18
135.0 110.0 85.0 8 1
134.5 109.5 84.5 15 17
134.0 109.0 3 84.0 10 11
133.5 108.5 83.5 9 3
133.0 108.0 2 83.0 28 20
132.5 107.5 1 82.5 2
132.0 107.0 82.0 10 14
131.5 106.5 2 81.5 14 1
131.0 106.0 81.0 13 20
130.5 105.5 7 3 80.5 13 7
130.0 105.0 80.0 8 8
129.5 104.5 5 4 79.5 17 10
129.0 104.0 1 1 79.0 7 3
128.5 103.5 78.5 19 21
128.0 103.0 6 78.0 10 3
127.5 102.5 77.5 7 14
127.0 102.0 9 2 77.0 19 12
126.5 101.5 1 76.5 7 6
126.0 101.0 12 4 76.0 10 19
125.5 1 1 100.5 5 75.5 3 1
American Mathematics Competitions
2005 AMC 12 B Results for Oregon
SCORE DISTRIBUTION
GENDER
Score # Students Score # Students Score # Students
male female male female male female
75.0 8 10 50.0 2 1 25.0
74.5 16 6 49.5 1 24.5
74.0 6 6 49.0 24.0 1
73.5 9 12 48.5 2 23.5
73.0 5 3 48.0 1 4 23.0
72.5 6 5 47.5 1 22.5
72.0 12 2 47.0 1 22.0
71.5 5 4 46.5 1 21.5
71.0 13 5 46.0 1 1 21.0
70.5 5 4 45.5 20.5
70.0 8 9 45.0 1 20.0
69.5 7 2 44.5 1 1 19.5
69.0 7 8 44.0 19.0
68.5 2 3 43.5 1 18.5
68.0 3 3 43.0 1 18.0
67.5 4 7 42.5 17.5
67.0 2 4 42.0 2 1 17.0
66.5 2 5 41.5 16.5
66.0 11 5 41.0 2 1 16.0
65.5 1 40.5 15.5
65.0 6 5 40.0 15.0
64.5 3 3 39.5 14.5
64.0 3 2 39.0 14.0
63.5 3 4 38.5 1 13.5
63.0 2 1 38.0 13.0
62.5 4 2 37.5 1 12.5
62.0 3 2 37.0 1 12.0
61.5 2 4 36.5 11.5
61.0 6 36.0 2 2 11.0
60.5 3 1 35.5 10.5
60.0 7 3 35.0 10.0
59.5 3 2 34.5 1 9.5
59.0 4 3 34.0 9.0
58.5 1 1 33.5 8.5
58.0 3 2 33.0 8.0
57.5 4 1 32.5 7.5
57.0 2 2 32.0 7.0
56.5 5 1 31.5 6.5
56.0 2 2 31.0 6.0
55.5 30.5 5.5
55.0 30.0 2 2 5.0
54.5 1 29.5 4.5
54.0 1 1 29.0 4.0
53.5 1 1 28.5 3.5
53.0 2 2 28.0 3.0
52.5 27.5 2.5
52.0 1 27.0 2.0
51.5 1 2 26.5 1.5
51.0 1 1 26.0 1.0
50.5 25.5 .5
0.0 0 0
American Mathematics Competitions
2005 AMC 12 B Results for Oregon
SCORE DISTRIBUTION
score -----------grade-----------
6 7 8 9 10 11 12 13 unknown
---------------------------
125.5 2
123.0 1 1
118.5 1 1
118.0 1
116.0 1 2
115.0 1
113.5 1 1
112.5 1 2
111.5 3
111.0 1
109.0 1 2
108.0 2
107.5 1
106.5 1 1
105.5 6 4 1
104.5 1 4 5
104.0 1 1
103.0 1 4 2
102.0 1 6 5
101.5 1
101.0 2 5 9 1
100.5 1 1 4
99.5 1 3 3
98.5 1 1 11 15
98.0 1 3
97.5 1 4 6 3
97.0 1 5 7
96.0 2 12 13 1
95.5 1 2
95.0 1 3 6 19 23 4
94.5 3 5
94.0 1 2 6 2
93.5 1 7 7
92.5 1 8 15 14 2
92.0 1 3
91.5 3 12 16 1
91.0 7 7
90.5 5 6 4 1
90.0 1 7 8 1
89.5 1
89.0 1 6 27 28 7
88.5 3 3
88.0 5 19 13 3
87.5 6 10 1
87.0 1 1 10 6 1
86.5 1 1 6 17 18
86.0 1 1
85.5 2 4 16 10
85.0 3 6
84.5 3 7 15 8 1
84.0 1 1 15 4 1
83.5 1 3 6 3 1
83.0 2 2 27 22 1
82.5 1 1
82.0 1 2 11 12 1
81.5 1 1 5 10
81.0 1 1 3 23 6 1
80.5 1 4 10 6 1
80.0 2 3 8 3 1
79.5 4 16 11
79.0 7 3
78.5 1 10 14 16 2
78.0 2 4 6 2
77.5 1 1 3 11 6 1
77.0 1 18 15 3
76.5 2 10 2 1
76.0 1 6 16 7
75.5 3 1
75.0 1 3 10 4
74.5 1 5 11 6 2
74.0 1 3 8
73.5 4 9 11 1
73.0 1 5 4
72.5 1 10
72.0 1 7 6
71.5 1 3 6
71.0 3 11 5 4
70.5 3 6 1
70.0 1 1 11 4 1
69.5 1 1 5 5
69.0 1 9 6
68.5 4 1
68.0 4 2
67.5 1 5 5
67.0 1 1 4
66.5 1 5 3 1
66.0 11 5 1
65.5 1 1
65.0 2 6 4
64.5 1 2 3
64.0 5
63.5 3 3 2 2
63.0 2 1
62.5 1 5 1
62.0 1 2 3 1
61.5 4 2 1
61.0 4 2 1
60.5 1 1 2
60.0 1 5 3 2
59.5 3 2
59.0 6 1
58.5 1 2
58.0 1 4
57.5 5 1
57.0 2 2
56.5 3 1 2
56.0 4
54.5 2
54.0 3 1
53.5 1 1
53.0 1 2 1
52.0 1
51.5 2 1
51.0 2
50.0 2 1
49.5 1
49.0 1
48.5 2
48.0 4 1
47.5 1
47.0 1
46.5 1
46.0 1 1
45.0 1
44.5 2
43.5 1
43.0 1
42.0 2 1 1
41.0 3
38.5 1
37.5 1
37.0 1
36.0 3 1
35.0 1
34.5 1
32.5 1
30.0 1 3
24.0 1
American Mathematics Competitions
2005 AMC 12 B Results for Oregon
Analysis
Table of Item Difficulty for the 2005
American High School Mathematics Examination
Tabulation of responses for all Participants
Percent of Responses
ITEM A B C D E OMITS ?
____ _____ _____ _____ _____ _____ _____ _____
1 9.04* 0.14 0.38 0.14 0.26 0.03 0.01
2 0.05 0.20 0.09 8.74* 0.21 0.72 0.00
3 0.08 0.07 9.06* 0.10 0.27 0.42 0.00
4 0.08 8.70* 0.21 0.13 0.18 0.70 0.00
5 7.36* 0.08 0.63 0.03 0.05 1.85 0.00
6 2.20* 0.84 0.55 0.23 0.25 5.92 0.00
7 0.85 1.33 0.14 1.66* 0.30 5.72 0.00
8 1.05 1.68 3.85* 0.04 0.91 2.47 0.01
9 0.36 7.28* 0.26 0.32 0.25 1.53 0.00
10 0.15 0.52 0.11 1.82 2.85* 4.55 0.00
11 0.93 0.82 0.62 4.31* 0.50 2.83 0.00
12 0.23 0.51 0.57 0.44* 0.08 8.17 0.00
13 0.35 0.27 0.18 0.88* 0.18 8.13 0.01
14 0.48 0.80 0.48 0.37 0.69* 7.17 0.01
15 0.38 0.29 0.31 4.46* 0.40 4.16 0.00
16 0.21 0.19 0.56 0.25* 0.20 8.58 0.00
17 0.21 0.33* 0.22 0.09 0.54 8.61 0.00
18 1.02 0.33 0.36* 0.21 0.23 7.85 0.00
19 0.21 0.18 0.18 0.25 1.67* 7.51 0.00
20 0.04 0.27 3.93* 0.62 1.57 3.57 0.00
21 0.10 0.24 0.20* 0.18 0.12 9.15 0.00
22 0.37 0.57 0.12 0.12 0.04* 8.78 0.00
23 0.10 0.07* 0.10 0.05 0.08 9.60 0.00
24 0.20* 0.11 0.25 0.17 0.11 9.17 0.00
25 0.14* 0.23 0.18 0.12 0.28 9.05 0.00
(*) Correct Response
(?) Response the computer was unable to read due to incomplete
erasures or two answers marked in the same column