Cumulative Distributions

Abstract

In the simple frequency distribution discussed in Chapter I, the frequency of each class interval is shown separately. The total number of cases in the group is found by adding up the frequencies recorded in each class interval. Such a method of organising a mass of data into class intervals, we have found very useful. From such tables we can learn, for example, the number of factory workers between forty and forty-five years of age, the number of students who scored between 50 and 60 marks in a test, the number of employees earning between £28 and £29 a week, the number of workers who can produce between 30 and 40 units per day, and so on.