Civil Engineering Reference
In-Depth Information
TABLE 9.2 Percentile Values with their k factors
Below Mean
Above Mean
Percentile
Factor k
Percentile
Factor k
0.001
2
4.25
50
0
0.01
3.72
51
0.03
2
0.1
2
3.09
52
0.05
0.5
2
2.58
53
0.08
1
2
2.33
54
0.10
2
2.05
55
0.13
2
2.5
2
1.96
56
0.15
3
2
1.88
57
0.18
4
2
1.75
58
0.20
5
1.64
59
0.23
2
6
1.55
60
0.25
2
7
2
1.48
61
0.28
8
2
1.41
62
0.31
9
1.34
63
0.33
2
10
1.28
64
0.36
2
11
2
1.23
65
0.39
12
2
1.18
66
0.41
13
1.13
67
0.44
2
14
1.08
68
0.47
2
15
2
1.04
69
0.50
16
2
0.99
70
0.52
17
2
0.95
71
0.55
18
0.92
72
0.58
2
19
2
0.88
73
0.61
20
2
0.84
74
0.64
21
2
0.81
75
0.67
22
0.77
76
0.71
2
23
0.74
77
0.74
2
24
2
0.71
78
0.77
25
2
0.67
79
0.81
26
0.64
80
0.84
2
27
0.61
81
0.88
2
28
2
0.58
82
0.92
29
2
0.55
83
0.95
30
0.52
84
0.99
2
31
0.50
85
1.04
2
32
2
0.47
86
1.08
33
2
0.44
87
1.13
34
2
0.41
88
1.18
35
0.39
89
1.23
2
36
2
0.36
90
1.28
37
2
0.33
91
1.34
38
2
0.31
92
1.41
39
0.28
93
1.48
2
40
2
0.25
94
1.55
41
2
0.23
95
1.64
42
2
0.20
96
1.75
43
0.18
97
1.88
2
44
0.15
98
2.05
2
45
2
0.13
99
2.33
46
2
0.10
99.5
2.58
47
0.08
99.9
3.09
2
48
0.05
99.99
3.72
2
49
2
0.03
99.999
4.26
50
0
Note: Any percentile value p can be calculated from the mean m and the
standard deviation SD (normal distribution assumed) by p
¼
m
þ
kD.
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