
| Middle of category | Frequency | Frequency % | Cummulative frequency % |
| 3.69 | 544 | 18.3 | 18.3 |
| 3.79 | 900 | 30.2 | 48.5 |
| 3.90 | 523 | 17.6 | 66.0 |
| 4.00 | 191 | 6.4 | 72.4 |
| 4.10 | 94 | 3.2 | 75.6 |
| 4.21 | 43 | 1.4 | 77.0 |
| 4.31 | 37 | 1.2 | 78.3 |
| 4.41 | 33 | 1.1 | 79.4 |
| 4.51 | 31 | 1.0 | 80.4 |
| 4.62 | 25 | 0.8 | 81.3 |
| 4.72 | 63 | 2.1 | 83.4 |
| 4.82 | 63 | 2.1 | 85.5 |
| 4.92 | 67 | 2.2 | 87.7 |
| 5.03 | 86 | 2.9 | 90.6 |
| 5.13 | 89 | 3.0 | 93.6 |
| 5.23 | 78 | 2.6 | 96.2 |
| 5.34 | 54 | 1.8 | 98.1 |
| 5.44 | 34 | 1.1 | 99.2 |
| 5.54 | 17 | 0.6 | 99.8 |
| 5.64 | 5 | 0.2 | 99.9 |
| 5.75 | 2 | 0.1 | 100.0 |
FYI: Regression on these (log-log) data points gives a line with slope of -1.69 and y-intercept of 12.03. The correlation coefficient is -0.759171774494295.
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.