
| Middle of category | Frequency | Frequency % | Cummulative frequency % |
| 3.78 | 714 | 2.1 | 2.1 |
| 3.88 | 5711 | 16.4 | 18.5 |
| 3.98 | 6685 | 19.2 | 37.7 |
| 4.09 | 9503 | 27.3 | 65.0 |
| 4.19 | 5077 | 14.6 | 79.7 |
| 4.29 | 3126 | 9.0 | 88.6 |
| 4.39 | 1357 | 3.9 | 92.5 |
| 4.50 | 627 | 1.8 | 94.4 |
| 4.60 | 347 | 1.0 | 95.3 |
| 4.70 | 327 | 0.9 | 96.3 |
| 4.80 | 267 | 0.8 | 97.1 |
| 4.90 | 186 | 0.5 | 97.6 |
| 5.01 | 138 | 0.4 | 98.0 |
| 5.11 | 153 | 0.4 | 98.4 |
| 5.21 | 126 | 0.4 | 98.8 |
| 5.31 | 73 | 0.2 | 99.0 |
| 5.41 | 65 | 0.2 | 99.2 |
| 5.52 | 74 | 0.2 | 99.4 |
| 5.62 | 50 | 0.1 | 99.5 |
| 5.72 | 39 | 0.1 | 99.7 |
| 5.82 | 22 | 0.1 | 99.7 |
| 5.92 | 25 | 0.1 | 99.8 |
| 6.03 | 22 | 0.1 | 99.9 |
| 6.13 | 19 | 0.1 | 99.9 |
| 6.23 | 3 | 0.0 | 99.9 |
| 6.33 | 9 | 0.0 | 99.9 |
| 6.43 | 3 | 0.0 | 100.0 |
| 6.54 | 1 | 0.0 | 100.0 |
| 6.64 | 3 | 0.0 | 100.0 |
| 6.74 | 1 | 0.0 | 100.0 |
| 6.84 | 2 | 0.0 | 100.0 |
| 6.95 | 1 | 0.0 | 100.0 |
| 7.05 | 5 | 0.0 | 100.0 |
| 7.15 | 1 | 0.0 | 100.0 |
| 7.25 | 0 | 0.0 | 100.0 |
| 7.35 | 0 | 0.0 | 100.0 |
| 7.46 | 0 | 0.0 | 100.0 |
| 7.56 | 0 | 0.0 | 100.0 |
| 7.66 | 0 | 0.0 | 100.0 |
| 7.76 | 1 | 0.0 | 100.0 |
| 7.86 | 0 | 0.0 | 100.0 |
| 7.97 | 0 | 0.0 | 100.0 |
| 8.07 | 1 | 0.0 | 100.0 |
FYI: Regression on these (log-log) data points gives a line with slope of -2.41 and y-intercept of 17.42. The correlation coefficient is -0.955998064267428.
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.