
| Middle of category | Frequency | Frequency % | Cummulative frequency % |
| 3.70 | 271 | 28.1 | 28.1 |
| 3.80 | 398 | 41.3 | 69.4 |
| 3.90 | 204 | 21.2 | 90.6 |
| 4.01 | 45 | 4.7 | 95.2 |
| 4.11 | 12 | 1.2 | 96.5 |
| 4.21 | 5 | 0.5 | 97.0 |
| 4.32 | 7 | 0.7 | 97.7 |
| 4.42 | 3 | 0.3 | 98.0 |
| 4.52 | 3 | 0.3 | 98.3 |
| 4.63 | 3 | 0.3 | 98.7 |
| 4.73 | 1 | 0.1 | 98.8 |
| 4.83 | 3 | 0.3 | 99.1 |
| 4.94 | 4 | 0.4 | 99.5 |
| 5.04 | 0 | 0.0 | 99.5 |
| 5.14 | 4 | 0.4 | 99.9 |
| 5.25 | 0 | 0.0 | 99.9 |
| 5.35 | 1 | 0.1 | 100.0 |
3.69794800851396...5.6021188208797 3.80120434615161...5.98645200528444 3.90446068378926...5.31811999384422 4.00771702142691...3.80666248977032 4.11097335906457...2.484906649788 4.21422969670222...1.6094379124341 4.31748603433986...1.94591014905531 4.42074237197752...1.09861228866811 4.52399870961517...1.09861228866811 4.62725504725282...1.09861228866811 4.73051138489047...0 4.83376772252812...1.09861228866811 4.93702406016577...1.38629436111989 5.14353673544107...1.38629436111989 5.35004941071637...0
FYI: Regression on these (log-log) data points gives a line with slope of -3.34 and y-intercept of 17.12. The correlation coefficient is -0.842461354608271.
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.