
| Middle of category | Frequency | Frequency % | Cummulative frequency % |
| 3.67 | 10 | 5.7 | 5.7 |
| 3.77 | 16 | 9.2 | 14.9 |
| 3.87 | 10 | 5.7 | 20.7 |
| 3.97 | 6 | 3.4 | 24.1 |
| 4.07 | 23 | 13.2 | 37.4 |
| 4.17 | 30 | 17.2 | 54.6 |
| 4.27 | 18 | 10.3 | 64.9 |
| 4.37 | 12 | 6.9 | 71.8 |
| 4.47 | 4 | 2.3 | 74.1 |
| 4.57 | 9 | 5.2 | 79.3 |
| 4.67 | 3 | 1.7 | 81.0 |
| 4.77 | 6 | 3.4 | 84.5 |
| 4.87 | 6 | 3.4 | 87.9 |
| 4.97 | 10 | 5.7 | 93.7 |
| 5.07 | 7 | 4.0 | 97.7 |
| 5.17 | 4 | 2.3 | 100.0 |
3.66541693822886...2.30258509299405 3.76561022466661...2.77258872223978 3.86580351110435...2.30258509299405 3.9659967975421...1.79175946922805 4.06619008397984...3.13549421592915 4.16638337041759...3.40119738166216 4.26657665685533...2.89037175789616 4.36676994329308...2.484906649788 4.46696322973082...1.38629436111989 4.56715651616856...2.19722457733622 4.66734980260631...1.09861228866811 4.76754308904405...1.79175946922805 4.8677363754818...1.79175946922805 4.96792966191954...2.30258509299405 5.06812294835729...1.94591014905531 5.16831623479503...1.38629436111989
FYI: Regression on these (log-log) data points gives a line with slope of -0.71 and y-intercept of 5.34. The correlation coefficient is -0.52350358063191.
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.