
| Middle of category | Frequency | Frequency % | Cummulative frequency % |
| 3.51 | 93 | 0.5 | 0.5 |
| 3.61 | 1477 | 8.5 | 9.0 |
| 3.71 | 1657 | 9.5 | 18.5 |
| 3.81 | 1486 | 8.5 | 27.1 |
| 3.92 | 1916 | 11.0 | 38.1 |
| 4.02 | 1930 | 11.1 | 49.2 |
| 4.12 | 1741 | 10.0 | 59.2 |
| 4.22 | 992 | 5.7 | 64.9 |
| 4.32 | 731 | 4.2 | 69.1 |
| 4.42 | 489 | 2.8 | 71.9 |
| 4.52 | 420 | 2.4 | 74.3 |
| 4.62 | 543 | 3.1 | 77.4 |
| 4.73 | 851 | 4.9 | 82.3 |
| 4.83 | 836 | 4.8 | 87.1 |
| 4.93 | 709 | 4.1 | 91.2 |
| 5.03 | 542 | 3.1 | 94.3 |
| 5.13 | 395 | 2.3 | 96.6 |
| 5.23 | 229 | 1.3 | 97.9 |
| 5.33 | 145 | 0.8 | 98.7 |
| 5.43 | 77 | 0.4 | 99.2 |
| 5.53 | 43 | 0.2 | 99.4 |
| 5.64 | 15 | 0.1 | 99.5 |
| 5.74 | 16 | 0.1 | 99.6 |
| 5.84 | 13 | 0.1 | 99.7 |
| 5.94 | 15 | 0.1 | 99.7 |
| 6.04 | 3 | 0.0 | 99.8 |
| 6.14 | 4 | 0.0 | 99.8 |
| 6.24 | 10 | 0.1 | 99.8 |
| 6.34 | 4 | 0.0 | 99.9 |
| 6.44 | 6 | 0.0 | 99.9 |
| 6.55 | 5 | 0.0 | 99.9 |
| 6.65 | 3 | 0.0 | 99.9 |
| 6.75 | 1 | 0.0 | 100.0 |
| 6.85 | 0 | 0.0 | 100.0 |
| 6.95 | 1 | 0.0 | 100.0 |
| 7.05 | 0 | 0.0 | 100.0 |
| 7.15 | 2 | 0.0 | 100.0 |
| 7.25 | 1 | 0.0 | 100.0 |
| 7.36 | 0 | 0.0 | 100.0 |
| 7.46 | 0 | 0.0 | 100.0 |
| 7.56 | 0 | 0.0 | 100.0 |
| 7.66 | 1 | 0.0 | 100.0 |
| 7.76 | 2 | 0.0 | 100.0 |
| 7.86 | 0 | 0.0 | 100.0 |
| 7.96 | 0 | 0.0 | 100.0 |
| 8.06 | 0 | 0.0 | 100.0 |
| 8.16 | 0 | 0.0 | 100.0 |
| 8.27 | 1 | 0.0 | 100.0 |
FYI: Regression on these (log-log) data points gives a line with slope of -2.02 and y-intercept of 15.08. The correlation coefficient is -0.927637864655994.
This program is a version of demo.cgi by Sanford Morton, heavily modified by Michael Grobe to include data input, categorization, and regression. The program uses Perl module Chart::Plot, written by Sanford Morton and downloaded from www.speakeasy.org, to draw plots.