Class 9 Maths Revision Notes for Probability of Chapter 15 -CoolGyan

Class 9 Maths Revision Notes for Probability of Chapter 15 - Free PDF Download

Free PDF download of Class 9 Maths revision notes & short key-notes for Probability of Chapter 15 to score high marks in exams, prepared by expert mathematics teachers from latest edition of CBSE books.

CBSE Class 09 Mathematics
Revison Notes
Chapter 15
PROBABILITY

Probability – An Experimental Approach

Experiment - A procedure which produces some well defined possible outcomes..
Random experiment - An experiment which when performed produces one of the several possible outcomes called a random experiment.
Trial - When we perform an experiment it is called a trial of the experiment.
Event - The set of outcomes of an experiment to which probability is assigned.It is usually denoted by capital letter of English alphabets like A, B, E etc.
A collection of two or more possible outcomes (elementary events) of an experiment called a compound event.
An event is said to be happen in trial if any one of the elementary events (or outcomes) satisfying its conditions is an outcome.
The empirical (or experimental) probability P(E) of an event E is given by $P (E) = \frac{N u m b e r o f t r i a l s i n w h i c h E h a s h a p p e n d}{T o t a l n o . o f t r i a l}$
The probability of an event lies between 0 and 1 (0 and 1 are included)
Impossible event: Event which never happen.
Certain event - event which definitely happen.