A root-mean-square RMS formulation translates the PSD curve for each response quantity into a single most likely value. Prostate size or length width and height. It gives the frequency per unit for the data in this class where the unit is the unit of measurement of the data.
Below is a frequency distribution table representing number of students absent in every grade.
With a sample size of 20 gas stations the relative frequency of each class equals the actual number of gas stations divided by 20. The class width is the difference in the group and this changes. FREQUENCY DENSITY FREQUENCY CLASS WIDTH. If we look at the first group we can see it has a frequency of 4 and a width of 20 because 20 - 0 20.