Class 11th Statistics

This chapter explains what statistics is, why it is important, and how it is used in economics, business, and daily life. Students learn about the scope, limitations, and the role of statistics in decision-making. It builds the foundation for all future chapters.

📘Chapter 2: Collection of Data

Here, students explore methods of collecting primary and secondary data, drafting questionnaires, and understanding census vs. sampling. The focus is on accuracy, reliability, and choosing the right method for data collection.

📘Chapter 3: Organisation of Data

This chapter covers the classification and tabulation of data into rows, columns, and frequency distributions. Students learn how proper organisation makes analysis easier and more effective.

📘Chapter 4: Presentation of Data

Students learn how to present data visually using bar diagrams, histograms, pie charts, and frequency polygons. The aim is to make data easy to understand and compare.

📘Chapter 5: Measures of Central Tendency – Mean, Median, and Mode

This chapter teaches how to summarise data using averages. Students learn to calculate mean, median, and mode for both grouped and ungrouped data, and when each measure is most suitable.

📘Chapter 6: Measures of Dispersion

Here, students understand how spread out data values are. Topics include range, mean deviation, and standard deviation, along with their importance in comparing datasets.

📘Chapter 7: Correlation

This chapter explains how two variables are related. Students learn about positive, negative, and zero correlation, and methods like Karl Pearson’s coefficient and Spearman’s rank correlation.

📘Chapter 8: Index Numbers

Students explore how index numbers measure changes in prices, quantities, or values over time. They also learn how to construct and interpret various types of index numbers, including consumer price index.

📘Chapter 9: Use of Statistical Tools

The final chapter focuses on applying all the tools learned to analyse economic data and draw meaningful conclusions. It encourages critical thinking and real-world application of statistical methods.

Revision Series provides free quizzes, MCQs, and Class 11 Statistics notes to help students prepare effectively. You can practice chapter-wise topics like Collection of Data Class 11, Organisation of Data Quiz, and Presentation of Data MCQs to strengthen your understanding. Our resources cover Measures of Central Tendency Class 11, Measures of Dispersion Quiz, and Correlation Class 11 Statistics with instant answers. Students can also attempt topic-based tests on Index Numbers MCQs and Statistical Tools Class 11 for complete exam preparation. All quizzes and notes are designed according to the latest CBSE syllabus, making them ideal for quick revision. With no login required, Revision Series ensures Class 11 Statistics learning is simple, interactive, and absolutely free.