Revision Notes For CBSE Class 9 Math Chapter -15 Probability

Probability is a branch of maths which deals with calculating the likelihood of an event happening. Directly or indirectly, probability plays an important role in day to day activities.

For example, Rolling a die or flipping a coin. When we flip a coin, there are only two possible outcomes, the result is either heads or tail. In the same way, when we roll a die, there are six possible outcomes, the result may be any of these- 1, 2, 3, 4, 5, 6.

The formula for calculating the probability is:

Probability = Number of favourable outcomes / Total number of possible outcomes

For Example

There are 6 fruits in a bowl, 3 are apple, 2 are guava and 1 is banana. What is the probability of picking a guava?

The probability is the number of guava in the bag divided by the total number of fruits = P(A) = NO of favourable outcomes / Total number of possible outcomes

= P(A) = 2 / 6 = 1 / 3.

CBSE Class 9 Maths Chapter 15 Notes 

For more information about the Probability, click on the below-mentioned links.

Frequently asked Questions on CBSE Class 9 Maths Notes Chapter 15: Probability

What is ‘Favourable outcome’ in geometry?

Favorable Outcome is the result that is desired. For ex. Roll a 4 on a die: 4 is the only favorable outcome.

What are uses of Probability?

Probability provides information about the likelihood that something will happen. Meteorologists, for instance, use weather patterns to predict the probability of rain.

What is an ‘Outcome’?

The outcome is the final result of something, or the way things end up.

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