The arrangement of ungrouped data in the form of a group is called the frequency distribution of data. It classifies the data into different classes by dividing the entire range of variables into a suitable number of groups called classes.
A frequency distribution is an overview of all distinct values of some variable and the number of times they occur. A frequency distribution tells how frequencies are distributed overvalues. It is one of the ways to represent the data to extract meaningful information from it.
The lower and upper boundary figures of a class are called the lower limit and upper limit, respectively, and the difference between the limits is called the width of the class or class interval. The value of variate lies in the middle of lower and upper limits.
- The number of observations in a particular class is called absolute frequency.
- The number of observations in a particular class divided by total frequency is called relative frequency.
- The cumulative frequency corresponding to any variate value is the number of observations less than or equal to that value.
- The cumulative frequency corresponding to a class is the total number of observations less than or equal to the upper limit of the class.
There are mainly two types of frequencies named Absolute and Relative frequencies.
Absolute frequency the number of observations in a particular category, whereas Relative frequency is the ratio of the number of times a value of the data occurs in all outcomes to the total number of outcomes.
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