What is Statistics? Why we use it ? & How we use statistics?


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.