CBSE · Class 9 · Mathematics · Chapter 7

The Mathematics of Maybe: Introduction to Probability

Understand probability as a way of measuring uncertainty, analysing possible outcomes, and reasoning about chance.

7 lessons 50 min
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Lessons in this chapter

  1. 1What Is Probability? and RandomnessProbability begins when mathematics admits it cannot promise what happens next.
  2. 2The Probability Scale and CertaintyFrom impossible to certain, every chance gets an address between 0 and 1.
  3. 3Experimental ProbabilityRepeat an experiment enough times and randomness starts revealing its habits.
  4. 4Theoretical and Statistical Probability and Long-Run BehaviourTheory predicts, data reports, and the long run tries to make them agree.
  5. 5Sample Spaces and EventsList every possible outcome first—probability dislikes missing guests.
  6. 6Tree DiagramsWhen outcomes start branching, a tree diagram keeps the family organised.
  7. 7Chapter Summary and PracticeTake one final chance on the chapter—fortunately, practice improves the odds.
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