Statistics >>Relative Frequency and Percentage Frequency
The frequency of a class when expressed as a rate of the total frequency of the distribution is called relative frequency and percentage frequency is the ratio of class frequency to the total frequency expressed as percentage.
Relative Frequency = class-frequency / Total Frequency
Percentage Frequency = Class frequency / Total Frequency
J. Frequency Density
It is the ratio of the class frequency to the width of that class.
Frequency density = Class Frequency / Width of Class
K. Cumulative Frequency
If for each class the frequencies given are aggregates of the preceding frequencies they are known- as cumulative frequencies.
L. Methods of Forming Class-intervals
There are two ways of forming class intervals.
Under this method a class interval is such that the lower limit is included in the preceding class where as the upper class limit is included in the succeeding class interval.
If a interval is such that the lower as well as the upper class limits are included in the same class interval, it is called inclusive class interval.
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