Class 9 Math Chapter 13 Probability Notes – Formulas, Examples & Easy Explanation

 Understand Class 9 Math Chapter 13 Probability with simple explanations, important formulas, and solved examples. Learn concepts like chance, outcomes, events, and probability formulas in an easy way.

Probability is an important chapter in Class 9 Mathematics that helps students understand the chances of events happening. It is widely used in daily life, statistics, and higher-level mathematics.

In this article, you will learn the basic concepts of probability, formulas, solved examples, and practice questions, along with a PDF download link for complete notes.

📌 What is Probability?

Probability means the likelihood or chance of an event occurring.

✅ Formula:

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👉 This formula is used to calculate the probability of any event.

📌 Types of Events

🔹 1. Certain Event

An event that will definitely happen.

👉 Example: Getting a number less than 7 on a die.

🔹 2. Impossible Event

An event that cannot happen.

👉 Example: Getting 7 on a standard die.

🔹 3. Simple Event

An event with only one outcome.

🔹 4. Compound Event

An event with more than one outcome.

📊 Sample Outcomes

🎲 Example: Rolling a Die

Possible outcomes = {1, 2, 3, 4, 5, 6}

👉 Total outcomes = 6

🪙 Example: Tossing a Coin

Possible outcomes = {Head, Tail}

👉 Total outcomes = 2

📊 Solved Examples

✅ Example 1:

Find the probability of getting a Head when tossing a coin.

👉 Solution:

Favorable outcomes = 1

Total outcomes = 2

👉 Probability = 1/2

✅ Example 2:

Find the probability of getting an even number on a die.

👉 Solution:

Even numbers = {2, 4, 6} → 3 outcomes

Total outcomes = 6

👉 Probability = 3/6 = 1/2

✅ Example 3:

Find the probability of getting a number greater than 4.

👉 Solution:

Numbers = {5, 6} → 2 outcomes

👉 Probability = 2/6 = 1/3

📝 Practice Questions

Find the probability of getting Tail in a coin toss?

Find probability of getting an odd number on a die?

What is an impossible event?

Define probability with formula?

Find probability of getting a number less than 3 on a die?

You can download the complete notes from the link below:

https://drive.google.com/file/d/1Zk-Oye-vhzvdEAAlH179fe20MevEtA1D/view?usp=drivesdk