
| Middle of category | Frequency | Frequency % | Cummulative frequency % |
| 3.69 | 285 | 14.1 | 14.1 |
| 3.79 | 520 | 25.8 | 40.0 |
| 3.90 | 297 | 14.7 | 54.7 |
| 4.00 | 139 | 6.9 | 61.6 |
| 4.10 | 81 | 4.0 | 65.6 |
| 4.21 | 39 | 1.9 | 67.5 |
| 4.31 | 29 | 1.4 | 69.0 |
| 4.41 | 30 | 1.5 | 70.5 |
| 4.51 | 28 | 1.4 | 71.9 |
| 4.62 | 22 | 1.1 | 73.0 |
| 4.72 | 62 | 3.1 | 76.0 |
| 4.82 | 60 | 3.0 | 79.0 |
| 4.92 | 66 | 3.3 | 82.3 |
| 5.03 | 83 | 4.1 | 86.4 |
| 5.13 | 85 | 4.2 | 90.6 |
| 5.23 | 78 | 3.9 | 94.5 |
| 5.34 | 54 | 2.7 | 97.2 |
| 5.44 | 33 | 1.6 | 98.8 |
| 5.54 | 17 | 0.8 | 99.7 |
| 5.64 | 5 | 0.2 | 99.9 |
| 5.75 | 2 | 0.1 | 100.0 |
3.69188480452309...5.65248918026865 3.79464267390982...6.25382881157547 3.89740054329655...5.6937321388027 4.00015841268328...4.93447393313069 4.10291628207001...4.39444915467244 4.20567415145674...3.66356164612965 4.30843202084347...3.36729582998647 4.4111898902302...3.40119738166216 4.51394775961693...3.3322045101752 4.61670562900366...3.09104245335832 4.71946349839039...4.12713438504509 4.82222136777712...4.0943445622221 4.92497923716385...4.18965474202643 5.02773710655058...4.4188406077966 5.13049497593731...4.44265125649032 5.23325284532404...4.35670882668959 5.33601071471077...3.98898404656427 5.4387685840975...3.49650756146648 5.54152645348423...2.83321334405622 5.64428432287096...1.6094379124341 5.74704219225769...0.693147180559945
FYI: Regression on these (log-log) data points gives a line with slope of -1.43 and y-intercept of 10.66. The correlation coefficient is -0.715894259862105.
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.