
| Middle of category | Frequency | Frequency % | Cummulative frequency % |
| 3.45 | 21 | 0.1 | 0.1 |
| 3.55 | 6778 | 19.4 | 19.5 |
| 3.65 | 13868 | 39.8 | 59.3 |
| 3.75 | 5176 | 14.8 | 74.1 |
| 3.85 | 2415 | 6.9 | 81.0 |
| 3.95 | 1144 | 3.3 | 84.3 |
| 4.05 | 851 | 2.4 | 86.7 |
| 4.15 | 722 | 2.1 | 88.8 |
| 4.25 | 595 | 1.7 | 90.5 |
| 4.35 | 448 | 1.3 | 91.8 |
| 4.45 | 334 | 1.0 | 92.7 |
| 4.55 | 379 | 1.1 | 93.8 |
| 4.65 | 433 | 1.2 | 95.1 |
| 4.75 | 489 | 1.4 | 96.5 |
| 4.86 | 580 | 1.7 | 98.1 |
| 4.96 | 277 | 0.8 | 98.9 |
| 5.06 | 132 | 0.4 | 99.3 |
| 5.16 | 64 | 0.2 | 99.5 |
| 5.26 | 46 | 0.1 | 99.6 |
| 5.36 | 31 | 0.1 | 99.7 |
| 5.46 | 19 | 0.1 | 99.8 |
| 5.56 | 10 | 0.0 | 99.8 |
| 5.66 | 6 | 0.0 | 99.8 |
| 5.76 | 6 | 0.0 | 99.8 |
| 5.86 | 4 | 0.0 | 99.8 |
| 5.96 | 3 | 0.0 | 99.9 |
| 6.06 | 4 | 0.0 | 99.9 |
| 6.16 | 1 | 0.0 | 99.9 |
| 6.26 | 5 | 0.0 | 99.9 |
| 6.36 | 7 | 0.0 | 99.9 |
| 6.46 | 8 | 0.0 | 99.9 |
| 6.56 | 4 | 0.0 | 99.9 |
| 6.66 | 3 | 0.0 | 99.9 |
| 6.76 | 2 | 0.0 | 100.0 |
| 6.86 | 3 | 0.0 | 100.0 |
| 6.96 | 0 | 0.0 | 100.0 |
| 7.06 | 0 | 0.0 | 100.0 |
| 7.16 | 1 | 0.0 | 100.0 |
| 7.26 | 0 | 0.0 | 100.0 |
| 7.36 | 0 | 0.0 | 100.0 |
| 7.46 | 0 | 0.0 | 100.0 |
| 7.56 | 2 | 0.0 | 100.0 |
| 7.66 | 2 | 0.0 | 100.0 |
| 7.76 | 4 | 0.0 | 100.0 |
| 7.86 | 2 | 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 |
| 8.26 | 2 | 0.0 | 100.0 |
FYI: Regression on these (log-log) data points gives a line with slope of -1.85 and y-intercept of 13.86. The correlation coefficient is -0.876723050220669.
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.