# Statistics

Statistics is a branch of mathematics in which we study the information in a meaningful way.

In statistics, we discuss various terms like mean, mode, median, classmark, Histogram, bar graph etc.

## 1.) Why we use statistics?

In numerical data or theoretical data, we can't understand the clear meaning.

In statistics, we show this data by a bar graph, pie chart, etc. Statistics make it easy to read this information for us.

## 2.) How to use statistics?

We use statistics as graphical representation & to measure central tendency in various ways to show the information-

### GRAPHICAL REPRESENTATION

### 1) Bar graph

The bar graph is used to compare among two quantities.

### 2) Pie graph (Circle graph)

The pie graph is a whole circle in which we show the part of the whole.

### 3) Histogram

The histogram is used for grouped data & it shows the variation of quantity in a particular class interval.

### 4) Line graph

The line graph shows how data continues to changes.

### MEASURE of CENTRAL TENDENCY

### 1) Mean

Mean is the average of whole data.

### 2) Mode

A mode is the number in given data which have high frequency.

Or

A number which comes more time than other numbers is known as Mode.

### 3) Median

Median is a number which divides the whole data into two parts.