**Category : **7th Class

It.is a graphical representation of frequency distribution in which class-intervals are taken along x - axis and frequency are taken along y - axis.

** Frequency Polygon**

The curve obtained by joining midpoints of successive tops of the rectangles of a histogram represents frequency polygon.

- Data is defined as the particular information in numeric form.
- Mean \[=\frac{sum\,of\,observation}{Total\,number\,of\,observation}\]
- If the number of observations is odd then median \[={{\left( \frac{n+1}{2} \right)}^{th}}\] observation
- If the number of observations is even Median \[=\frac{{{\left( \frac{n}{2} \right)}^{th}}observation+{{\left( \frac{n}{2}+1 \right)}^{th}}observation}{2}\]
- Mode is defined as the value of variable which has highest frequency.

- Stat-etymology was the early applications of statistical thinking revolved around the needs of states to base policy on demographic and economic data.
- Statistics help in prediction and forecasting using data and statistical models
- There are four main levels of measurement used in statistics: ratio, interval, nominal and ordinal.

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