Skip to main content
Super TutorResources
Chapter 8 of 9
Formula Sheet

Statistics — Formula Sheet

Tamil Nadu Board · Class 9 · Mathematics

4 formulas from Statistics (Tamil Nadu Board Class 9 Mathematics) on one page, grouped by topic. Covers Data and Its Types, Arithmetic Mean and Median.

45 questions25 flashcards4 formulas & key relations5 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 formula sheet and more.

Try Super Tutor — Free

Free trial, no card needed.

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

Learn better with visuals Super Tutor pairs illustrations like this with notes and quizzes for Statistics.

4 Entries · 3 Sections

Formulas and Key Relations

Arithmetic Mean

For Raw Data

Mean = Sum of all observations ÷ Number of observations.

For Ungrouped Frequency Distribution

Mean = Σfx ÷ Σf, where f is the frequency and x is the value.

Median

For Raw Data (odd n)

Median = value at position ((n+1)/2)th.

Key relations

For odd number of observations (n), Median = ((n+1)/2)th value.

Full sheet with units and worked examples

View All

Frequently Asked Questions

What are the important topics in Statistics for Tamil Nadu Board Class 9 Mathematics?
Key topics in Statistics include Data and Its Types, Arithmetic Mean, Median, Mode. Study these first, then practise questions on each for Class 9 exams.
How many formulas are in Statistics?
This sheet lists 4 formulas from Statistics, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Statistics for Class 9 exams?
Learn the core ideas first, then work through the 45 practice questions on Statistics. Revise 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 Tamil Nadu Board Class 9 Mathematics Formula Sheet

For serious students

Get the full Statistics chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for Tamil Nadu Board Class 9 Mathematics. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free