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2005 - AMC 12A & 12B Item Difficulty

2005 Contest Item Difficulty
for the AMC 12 A & B
CONTEST 12A Item Difficulty
ITEM
A
 
B
 
C
 
D
 
E
 
OMITS
?
1
0.56
 
0.66
 
1.22
 
94.05
*
1.18
 
2.32
0.01
2
0.24
 
93.83
*
1.74
 
2.84
 
0.31
 
1.04
0.02
3
3.69
 
43.23
*
11.18
 
4.29
 
4.80
 
32.79
0.02
4
69.65
*
3.30
 
24.85
 
0.66
 
0.36
 
1.16
0.02
5
2.09
 
69.30
*
17.99
 
1.06
 
0.60
 
8.96
0.01
6
5.01
 
50.76
*
2.75
 
3.20
 
7.79
 
30.47
0.02
7
5.76
 
1.93
 
69.24
*
0.93
 
0.90
 
21.22
0.01
8
3.42
 
4.59
 
3.47
 
23.30
*
2.30
 
62.91
0.01
9
37.34
*
3.94
 
8.87
 
3.02
 
1.34
 
45.48
0.01
10
3.61
 
30.99
*
2.04
 
5.86
 
1.13
 
56.36
0.02
11
9.75
 
4.25
 
3.67
 
4.69
 
33.33
*
44.29
0.02
12
10.39
 
3.16
 
2.29
 
32.51
*
12.23
 
39.40
0.02
13
1.62
 
2.38
 
4.38
 
29.76
*
3.46
 
58.38
0.02
14
3.43
 
4.26
 
31.28
 
10.54
*
3.92
 
46.56
0.01
15
2.41
 
3.57
 
15.37
*
8.57
 
7.67
 
62.38
0.02
16
2.55
 
3.18
 
8.25
 
7.28
*
3.36
 
75.37
0.02
17
17.24
*
8.69
 
11.86
 
3.28
 
4.00
 
54.91
0.03
18
3.47
*
4.01
 
2.96
 
2.79
 
2.37
 
84.38
0.01
19
8.69
 
20.80
*
8.98
 
4.83
 
7.93
 
48.74
0.02
20
3.17
 
1.72
 
1.94
 
1.39
 
2.29
*
89.48
0.00
21
4.02
 
4.71
 
4.08
*
2.13
 
0.70
 
84.35
0.01
22
3.91
 
5.63
*
2.84
 
2.74
 
1.99
 
82.86
0.01
23
4.76
 
6.03
*
2.39
 
2.61
 
4.61
 
79.57
0.03
24
1.10
 
1.67
*
1.94
 
2.14
 
0.62
 
92.53
0.01
25
3.17
 
2.45
 
1.94
*
2.04
 
1.02
 
89.38
0.01
(*) Correct Response
(?) Response the computer was unable to read due to incomplete erasures or two answers marked in the same column
 
ITEM
A
 
B
 
C
 
D
 
E
 
OMITS
?
1
92.18
*
1.70
 
2.71
 
0.94
 
1.93
 
0.53
0.01
2
0.74
 
1.27
 
0.86
 
92.12
*
1.39
 
3.60
0.01
3
0.72
 
0.52
 
91.41
*
1.32
 
2.72
 
3.29
0.01
4
1.04
 
89.91
*
1.61
 
1.60
 
1.68
 
4.15
0.01
5
78.34
*
0.92
 
6.58
 
0.37
 
0.50
 
13.27
0.02
6
31.31
*
8.28
 
5.52
 
3.13
 
2.68
 
49.08
0.01
7
10.09
 
14.44
 
2.19
 
23.99
*
4.59
 
44.70
0.01
8
11.02
 
15.62
 
43.47
*
0.46
 
9.14
 
20.25
0.03
9
3.62
 
76.41
*
3.21
 
3.45
 
2.48
 
10.80
0.02
10
1.59
 
5.16
 
1.46
 
19.87
 
35.00
*
36.90
0.02
11
11.66
 
10.57
 
7.13
 
42.64
*
4.08
 
23.89
0.02
12
2.84
 
6.06
 
7.72
 
10.10
*
0.93
 
72.35
0.00
13
3.93
 
2.88
 
2.44
 
18.97
*
1.91
 
69.87
0.00
14
7.13
 
9.62
 
6.44
 
3.44
 
11.12
*
62.24
0.01
15
5.28
 
2.88
 
3.29
 
48.57
*
4.46
 
35.51
0.02
16
2.32
 
2.15
 
7.42
 
5.56
*
2.20
 
80.35
0.00
17
3.60
 
5.98
*
2.42
 
1.36
 
6.13
 
80.49
0.01
18
12.94
 
4.79
 
5.03
*
2.97
 
2.62
 
71.65
0.00
19
2.34
 
1.89
 
1.86
 
2.74
 
21.68
*
69.48
0.01
20
1.07
 
2.91
 
42.83
*
6.09
 
17.16
 
29.92
0.01
21
1.79
 
2.35
 
4.98
*
3.36
 
1.77
 
85.75
0.01
22
3.69
 
6.48
 
1.59
 
1.63
 
1.30
*
85.31
0.01
23
1.16
 
2.66
*
1.63
 
1.16
 
0.68
 
92.71
0.00
24
2.66
*
2.16
 
2.79
 
2.27
 
1.87
 
88.24
0.00
25
2.37
*
2.64
 
1.91
 
2.09
 
3.13
 
87.86
0.00
(*) Correct Response
(?) Response the computer was unable to read due to incomplete erasures or two answers marked in the same column