
| Middle of category | Frequency | Frequency % | Cummulative frequency % |
| 3.50 | 32 | 0.9 | 0.9 |
| 3.60 | 1331 | 38.2 | 39.1 |
| 3.71 | 880 | 25.2 | 64.3 |
| 3.81 | 406 | 11.6 | 75.9 |
| 3.91 | 178 | 5.1 | 81.0 |
| 4.01 | 118 | 3.4 | 84.4 |
| 4.11 | 101 | 2.9 | 87.3 |
| 4.21 | 74 | 2.1 | 89.4 |
| 4.31 | 66 | 1.9 | 91.3 |
| 4.42 | 50 | 1.4 | 92.8 |
| 4.52 | 48 | 1.4 | 94.2 |
| 4.62 | 40 | 1.1 | 95.3 |
| 4.72 | 45 | 1.3 | 96.6 |
| 4.82 | 40 | 1.1 | 97.7 |
| 4.92 | 40 | 1.1 | 98.9 |
| 5.02 | 17 | 0.5 | 99.4 |
| 5.12 | 6 | 0.2 | 99.5 |
| 5.23 | 3 | 0.1 | 99.6 |
| 5.33 | 4 | 0.1 | 99.7 |
| 5.43 | 2 | 0.1 | 99.8 |
| 5.53 | 2 | 0.1 | 99.9 |
| 5.63 | 0 | 0.0 | 99.9 |
| 5.73 | 2 | 0.1 | 99.9 |
| 5.83 | 0 | 0.0 | 99.9 |
| 5.94 | 0 | 0.0 | 99.9 |
| 6.04 | 0 | 0.0 | 99.9 |
| 6.14 | 0 | 0.0 | 99.9 |
| 6.24 | 1 | 0.0 | 99.9 |
| 6.34 | 0 | 0.0 | 99.9 |
| 6.44 | 0 | 0.0 | 99.9 |
| 6.54 | 1 | 0.0 | 100.0 |
| 6.64 | 0 | 0.0 | 100.0 |
| 6.75 | 0 | 0.0 | 100.0 |
| 6.85 | 0 | 0.0 | 100.0 |
| 6.95 | 0 | 0.0 | 100.0 |
| 7.05 | 0 | 0.0 | 100.0 |
| 7.15 | 0 | 0.0 | 100.0 |
| 7.25 | 0 | 0.0 | 100.0 |
| 7.35 | 0 | 0.0 | 100.0 |
| 7.45 | 0 | 0.0 | 100.0 |
| 7.56 | 0 | 0.0 | 100.0 |
| 7.66 | 1 | 0.0 | 100.0 |
FYI: Regression on these (log-log) data points gives a line with slope of -1.89 and y-intercept of 12.30. The correlation coefficient is -0.88412745262759.
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.