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Appendix D
Table D-2 (Symbol Contrast percentage ranges to
Numeric and Letter Grades)
Min
Max
70
100
69
69.99
67
68.99
66
66.99
64
65.99
63
63.99
61
62.99
60
60.99
58
59.99
57
57.99
55
56.99
54
54.99
52
53.99
51
51.99
49
50.99
48
48.99
46
47.99
45
45.99
43
44.99
42
42.99
40
41.99
38
39.99
36
37.99
34
35.99
32
33.99
30
31.99
28
29.99
26
27.99
24
25.99
22
23.99
20
21.99
18
19.99
16
17.99
14
15.99
12
13.99
10
11.99
8
9.99
6
7.99
4
5.99
2
3.99
0
1.99
RJS, Minneapolis, MN
74
Operator's Guide
Numeric
Letter
4.0
A
3.9
A
3.8
A
3.7
A
3.6
A
3.5
A
3.4
B
3.3
B
3.2
B
3.1
B
3.0
B
2.9
B
2.8
B
2.7
B
2.6
B
2.5
B
2.4
C
2.3
C
2.2
C
2.1
C
2.0
C
1.9
C
1.8
C
1.7
C
1.6
C
1.5
C
1.4
D
1.3
D
1.2
D
1.1
D
1.0
D
0.9
D
0.8
D
0.7
D
0.6
D
0.5
D
0.4
F
0.3
F
0.2
F
0.1
F
0.0
F
003-4500
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