## CBSE Class 9 Maths Chapter 14 Revision Notes: Statistics

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## CBSE Class 9 Maths Chapter 14 Revision Notes: Statistics

**Statistics:-**

A study dealing with the collection, presentation, interpretation and analysis of data is called as statistics.

**Data:-**

- Facts or figures that are numerical or otherwise, collected with a definite purpose and provide valuable information for interpretation and analysis are called data.
- Most of the available data is raw data.
- Raw data can be arranged systematically in order to draw meaningful inferences.
- Data collected directly from the source through observation or conversation, or participation is called primary data.
- The data gathered from a source where it already exists is called secondary data.
- The difference between the highest and lowest values in the given data is called the range of the given data.