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Probability — Concept Maps

Tamil Nadu Board · Class 9 · Mathematics

3 concept maps of Probability for Tamil Nadu Board Class 9 Mathematics, each also written out as a text outline.

44 questions28 flashcards5 formulas & key relations5 concepts

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A diagram illustrating a random experiment (e.g., rolling a fair six-sided die) showing all possible outcomes and how they form the sample space. Each outcome is distinct.
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3 Concept Maps

Probability – Complete Chapter Overview

Probability – Complete Chapter Overview

The map in words

  • Probability
    • Basic Concepts
      • Random Experiment
      • Trial
      • Outcome
      • Sample Point
      • Sample Space S
      • Event E
    • Two Approaches
      • Classical Approach
        • Equally likely outcomes
        • P of E = n of E divided by n of S
        • A priori method
      • Empirical Approach
        • Based on experiments
        • P of E = r divided by n
        • Relative Frequency
    • Range of Probability
      • Minimum Value = 0
      • Maximum Value = 1
      • Formula 0 less than or equal to P less than or equal to 1
    • Types of Events
      • Sure Event P = 1
      • Impossible Event P = 0
      • Equally Likely Events
      • Mutually Exclusive Events
      • Complementary Events
        • P of E plus P of E complement = 1
    • Standard Sample Spaces
      • One Coin n S = 2
      • Two Coins n S = 4
      • One Dice n S = 6
      • Two Dice n S = 36

Flowchart showing how a random experiment produces outcomes through trials

Flowchart showing how a random experiment produces outcomes through trials

The map in words

  • Random Experiment
    • Perform a Trial
      • What is the Result?
        • Outcome 1
          • Add to List of Possible Results
            • These form the Sample Space
        • Outcome 2
        • Outcome 3

Mind map showing relationship between sample space, outcomes, and events

Mind map showing relationship between sample space, outcomes, and events

The map in words

  • Sample Space
    • Definition
      • Set of all outcomes
      • Denoted by S
    • Examples
      • Coin Toss
        • S = H, T
      • Dice Roll
        • S = 1,2,3,4,5,6
      • Two Coins
        • S = HH,HT,TH,TT
    • Events
      • Subsets of S
      • Can contain 1 or more outcomes

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Frequently Asked Questions

What are the important topics in Probability for Tamil Nadu Board Class 9 Mathematics?
Key topics in Probability include Basic Concepts and Terminology, Classical Approach to Probability, Empirical (Experimental) Approach to Probability, Types of Events. Study these first, then practise questions on each for Class 9 exams.
What do the concept maps for Probability show?
The 3 maps show how the ideas in Probability connect: Probability – Complete Chapter Overview; Flowchart showing how a random experiment produces outcomes through trials. Each map is also written out as an outline on this page.
How should I revise Probability for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on Probability. 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 Probability

All Tamil Nadu Board Class 9 Mathematics Concept Maps

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