Probability Plotting Papers

This page provides free probability plotting papers for you to download in *.pdf format. The papers were created using the Weibull++ software. In addition, this page provides access to the rank tables required for probability plotting.

Probability Plotting Papers

To view and/or print, click the link. To save, right-click the link and choose Save link as.

Weibull Probability Plotting Paper (1, 2, 3 and 4 Cycles)

Lognormal Probability Plotting Paper (1, 2, 3 and 4 Cycles)

Normal Probability Plotting Paper

Exponential Probability Plotting Paper

Rank Tables by Sample Size

To read the Median Rank (50%) of the 10th failure from a sample of 25 units:

  1. Select the appropriate sample size table (i.e. 25).
  2. Read the value for the appropriate Order Number (i.e. O/N = 10) from the 50% column, as highlighted in yellow below: 0.38161 or 38.161%.
  3. For Ranks other than Median Ranks (other than 50%), use the appropriate percentage column.
Sample Size=25
O/N 10% 20% 30% 40% 50% 60% 70% 80% 90%
1 0.00421 0.00889 0.01420 0.02020 0.02730 0.03600 0.04700 0.06230 0.08799
2 0.02150 0.03310 0.04380 0.05460 0.06620 0.07926 0.09480 0.11509 0.14687
. . . . . . . . . .
. . . . . . . . . .
8 0.19625 0.23032 0.25657 0.28001 0.30270 0.32604 0.35166 0.38235 0.42582
9 0.23032 0.26656 0.29418 0.31865 0.34215 0.36619 0.39240 0.42357 0.46734
10 0.26529 0.30341 0.33217 0.35747 0.38161 0.40616 0.43276 0.46419 0.50795
11 0.30111 0.34082 0.37052 0.39646 0.42108 0.44596 0.47277 0.50424 0.54772
12 0.33774 0.37878 0.40921 0.43562 0.46054 0.48559 0.51244 0.54375 0.58668
. . . . . . . . . .
. . . . . . . . . .
24 0.85313 0.88491 0.90520 0.92074 0.93377 0.94535 0.95619 0.96690 0.97852
25 0.91201 0.93765 0.95298 0.96401 0.97265 0.97977 0.98583 0.99111 0.99579