Skip to main content
Super TutorResources
Chapter 8 of 9
QuestionsNotesFlashcardsSummaryFormulasQuizConceptsSyllabusPlan
Chapter Summary

Statistics

Tamil Nadu Board · Class 9 · Mathematics

Summary of Statistics for Tamil Nadu Board Class 9 Mathematics. Key concepts, important points, and chapter overview.

45 questions25 flashcards5 concepts

Interactive on Super Tutor

Studying Statistics? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for chapter summary and more.

Try Super Tutor — Free

1,000+ Class 9 students started this chapter today

An illustration comparing raw (ungrouped) data, arrayed data (sorted), and tabulated data (organized in a basic table with categories and totals).
Super Tutor

This is just one of 5+ visuals inside Super Tutor's Statistics chapter

Explore the full set

Overview

Statistics is the science of collecting, organising, analysing and interpreting data to make informed decisions. In our everyday life, we encounter vast amounts of numerical and non-numerical information that significantly impacts our decisions. This chapter focuses on understanding how to organize

Key Concepts

Data is collected information

Data is collected information, either numerical or qualitative. Primary data is original data collected directly by the investigator (through surveys,

Raw data becomes manageable by organizing

Raw data becomes manageable by organizing it into frequency tables. A class interval groups similar values together (e.g., 25-30, 31-35). Frequency is

The Arithmetic Mean is the most

The Arithmetic Mean is the most commonly used average, calculated by dividing the sum of all observations by the number of observations. Formula: Mean

The Median is the middle value

The Median is the middle value when data is arranged in ascending or descending order. For odd number of observations (n), Median = ((n+1)/2)th value.

The Mode is the value

The Mode is the value that appears most frequently in a dataset. For raw data, identify which number occurs the maximum times. For grouped data, use:

Learning Objectives

  • Understand the concepts of primary and secondary data, and raw data
  • Learn to organize ungrouped data into frequency tables using class intervals and tally marks
  • Master three methods of calculating Arithmetic Mean for raw, ungrouped, and grouped data (Direct, Assumed Mean, and Step Deviation methods)
  • Calculate the Median for ungrouped and grouped frequency distributions
  • Find the Mode for raw, ungrouped, and grouped data

Frequently Asked Questions

What are the important topics in Statistics for Tamil Nadu Board Class 9 Mathematics?
Key topics in Statistics include Statistics Chapter Overview Mind Map, Statistics Chapter - Complete Concept Map, Mind map showing the types of data collection methods and their categories. These are the concepts Tamil Nadu Board Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Statistics — Tamil Nadu Board Class 9 Mathematics?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Statistics

All 9 chapters — Tamil Nadu Board Class 9 Mathematics Chapter Summary

For serious students

Get the full Statistics chapter — for free.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for Tamil Nadu Board Class 9 Mathematics.

Try Super Tutor Free
Try the full chapter — Free