# NCERT Solutions for Class 9 Maths Chapter 15

NCERT Solutions for Class 9 Maths Chapter 15 Probability Exercise 15.1 in English Medium and प्रश्नावली 15.1 in Hindi Medium to study online or download in PDF form updated for new academic session 2020-21.

All NCERT Solutions 2020-21 and Offline Apps are free to download. Download NCERT Books 2020-2021 for CBSE Board, MP Board, Gujrat Board and UP Board for the new academic session 2020-21.## NCERT Solutions for Class 9 Maths Chapter 15

Class: | 9 |

Subject: | Maths – गणित |

Chapter 15: | Probability |

## 9th Maths Chapter 15 Solutions in English & Hindi Medium

NCERT Solutions for Class 9 Maths Chapter 15 Probability Exercise 15.1 in English Medium and Hindi Medium is given below. Visit to Discussion Forum to ask your doubts and share your knowledge with the others.

### 9th Maths Exercise 15.1 Solutions

### Study Material for 2020-21

##### What is meant by an Experiment in probability?

Experiment: An operation which can produce some well-defined outcomes, is called an experiment.

##### What is meant by Random Experiment?

Random Experiment: An experiment which, when repeated under identical conditions, do not produce the same outcomes every time, but if the outcomes produced is one out of the several possibilities, is known as a random experiment.

##### What is considered as an Event?

Event: A possible outcome or combination of outcomes is called an event.

##### Differentiate between Sure Event and Impossible Event.

Sure Event: If probability of an event is 1, then the event is called certain event or sure event.

Impossible Event: If probability of an event is 0, then event is called an impossible event.

#### Important Notes on 9th Maths Chapter 15

Basic Terms

1. The probability of an event is given by

P(E) = [Number of trials in which E has happened]/[Total number of trials].

2. The probability of happening of an event always lies from 0 to 1.

3. The sum of all the possibilities of all possible outcomes of an experiment is 1.

4. Experimental probability of an event can never be negative.

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### Important Questions on 9th Maths Chapter 15

गेंदें, जिनपर चौका मारा गया = 6

इसलिए, गेंदें, जिनपर चौका नहीं मारा गया = 30 – 6 = 24

P(चौका नहीं मारा गया )

= (24)/30 = 4/5 = 0.8

अतः, चौका न मारे जाने की प्रायिकता 0.8 है।

of Probability Theory.