Class 9 Maths - HARYANA
Probability
The chapter 'Probability' in Class 9 Mathematics introduces students to the quantitative study of chance and uncertainty. Based on the experimental or empirical approach, this chapter teaches you how to record outcomes of actual experiments and calculate the ratio of the number of favorable outcomes to the total number of trials. For the Haryana Board (BSEH) exams, this is a scoring chapter that lays the essential foundation for advanced probability concepts in higher classes. Students will practice calculating simple probabilities using everyday scenarios like coin tosses, dice rolls, and card draws.
Start Learning FreeKey Concepts
Trial
A single performance of a random experiment, such as tossing a coin once or rolling a die.
Outcome
A possible result of a trial or an experiment, like getting a head when tossing a coin.
Event
A collection of one or more outcomes of an experiment, representing the situation whose probability we want to find.
Experimental (Empirical) Probability
Probability based on the results of actual experiments and observations, rather than theoretical calculations.
Complementary Events
Events representing the opposite of a happening, where the sum of the probability of an event and its non-occurrence always equals 1.
Important Formulas
Board Exam Info
In the Haryana (BSEH) Class 9 Mathematics board examination, the chapter on Probability generally carries around 3 to 5 marks. Questions commonly include 1-mark objective multiple-choice questions (MCQs), 2-mark short answer questions based on coin/dice data tables, and occasional 3-mark word problems involving survey data or card outcomes.
Frequently Asked Questions
Can the probability of any event be greater than 1?
No, the probability of any event always lies between 0 and 1 (inclusive). It can never be negative or greater than 1.
What is the difference between theoretical and experimental probability?
Experimental probability (studied in Class 9) is based on actual practical trials and observations, while theoretical probability (studied in higher classes) is based on logical reasoning without actually performing the experiment.
Can a probability be expressed as a percentage?
Yes, probability can be represented as a fraction, a decimal, or a percentage ranging from 0% to 100%.
Learn Probability with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards