The number of times an observation occurs is called the **frequency**.

• Frequency is often denoted by the symbol * ( f )*.

## Frequency Distribution

**Frequency Distribution** is a statistical table which shows the set of all distinct values of the variables arranged in order of magnitude with their corresponding frequencies side by side.

**In other words**, a tabular arrangement of data showing the frequency of each observations is called a frequency distribution.

**There are two types of frequency distribution namely:**

**Univariate frequency distribution**

The frequency distributions showing only one variable are called univariate frequency distribution.

**Bivariate frequency distribution**

The frequency distributions showing the analysis of the relationship between two variables simultaneously is called Bivariate frequency distribution.

**In short**, The frequency distribution involving two variables are called Bivariate frequency distribution.

## i.) Univariate frequency distribution:

A univariate frequency distribution is further divided as follows:

## 1.) Individual series:

A series where items are listed individually rather than keeping in groups is called **individual series**.

• It is also known as **arrayed series**.

## 2.) Discrete series:

A series where items are arranged in a table showing the frequency with which each successive value of a discrete variable occurs is called** discrete series**.

• It is also known as **ungrouped frequency distribution**.

## 3.) Continuous series:

**Continuous series** refer to a type of data series where the data points or observations represent a continuous range of values within specific intervals or classes.

• It is also known as **grouped frequency distribution**.