These comprehensive RBSE Class 9 Maths Notes Chapter 15 Probability will give a brief overview of all the concepts.
RBSE Class 9 Maths Chapter 15 Notes Probability
1. Trial and events : An experiment of any context which must have an outcome out of several outcomes is called a trial and its possible outcomes are called events. For example : Drawing two cards from the deck of 52 cards is a trial and coming queen and king in those cards is an event.
2. Trial and outcome : Trial an action of doing an experiment at once and the results of trial are called outcomes.
3. A random experiment : An experiment which has many possible outcomes but none of them are predictable in advance, is called a random experiment.
4. Event: All the outcomes of a trial are called events. Each of them are events.
5. Favourable outcome : Those outcomes which show the occurence of an event are called favourable outcomes of that event.
6. Sample space : The collection of all possible outcomes of an event is called sample space.
7. Probability : The empirical probability of an event E is defined as :
\(\mathrm{P}(\mathrm{E})=\frac{\text { Number of trials in which the event }(\mathrm{E}) \text { happened }}{\text { Total number of trials }}\)
8. The probability of occurence of any event always lie from 0 to 1, in which both 0 and 1 are included.
9. Sure event : When the probability of occurence of any event is 1, the event is called a sure event.
10. Impossible event : When the probability of occurence of any event is zero, the event is called an impossible event.
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