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# NCERT Solutions for Class 9 Maths, Chapter 15 - Probability

In Class 9 Maths Chapter 15 Probability, we study about Probability as an experimental approach. The uncertainty involved in the terms ‘most probably’, ‘probably’, ‘chances’, ‘doubtful’, etc can be numerically measured in terms of ‘Probability’.

Probability can be defined as the extent to which an event is likely to occur, measured by the ratio of the favourable cases to the whole number of cases possible.

The probability of an event can be defined as the measure of the chance that an event will occur as a result of an experiment. The probability of an event X is the total number of ways the event X will occur, divided by the total number of possible outcomes.

Though probability was originally used for gambling, it has extensively been used in the fields of Commerce, Weather Forecasting, Physical Sciences, Medical Sciences and Biological Sciences.

You have already studied about probability in earlier classes, while performing experiments such as throwing dice, tossing coins etc. In this chapter, you will learn about measuring the chance of occurrence of a particular outcome in an experiment.

## Let us take a look at the topics and sub-topics of NCERT Solutions for Class 9 Maths Chapter 15:

15.1 Introduction

15.2 Probability: A theoretical Approach

15.3 Summary

## In Chapter 15 Maths Class 9, you will understand the following points:

1. The probability of an event lies between 0 and 1 (both 0 and 1 included)

2. The event of an experiment is the collection of a few outcomes of the experiment

3. The experimental probability P(E) of an event E is given by using the following formula-

P(E) = Number of trails in which E has happened Total number of trails

You can go through the following exercise for Probability Exercises and Solutions. For a better understanding and detailed solutions of this chapter, download UrbanPro’s Probability Class 9 NCERT Solutions PDF.

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