Frequency is referred as repetition. In statistics, frequency of a particular variable or an observation is a number which indicates how many number of times the variable or observation is repeated in the given data.

When the data is scattered, one may not know exactly what is the frequency of a particular observation. In order to make it convenient, frequency tables were introduced. Frequency table is a table that represents frequencies of each element in front of it. It is used to represent variables systematically that occur one or more times in a sample.

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2, 3, 3, 5, 7, 9, 7, 8, 9, 9, 2, 5, 3, 9, 3, 2, 5, 9, 8, 7, 3, 5, 7, 9, 8, 5, 2, 3

A grouped frequency table does have classes. The observations lying in each class interval are noted with corresponding tally marks and their frequency is written in front of each interval. Refer the following example .

8, 10, 43, 15, 22, 34, 23, 45, 28, 49, 30, 21, 29, 17, 33, 39, 41, 48, 33, 25

Here,

Lowest observation = 8

Highest observation = 49

Difference = 49 - 8 = 41

If we take 10 as the width of class interval, then

Number of classes = $\frac{41}{10}$ = 4.1

Which means 5 classes are required.

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Frequency Distribution | Cumulative Frequency |