NCERT Class 9 Maths Formula CBSE Board Sample Problems Part 14 (For CBSE, ICSE, IAS, NET, NRA 2022)

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14. Probability

Probability
S. No.TermDescription
1Empirical probabilityIt is a probability of event which is calculated based on experiments
2Empirical Probability =

Example:

A coin is tossed 1000 times; we get 499 times head and 501 times tail,

So empirical or experimental probability of getting head is calculated as

Empirical probability depends on experiment and different will get different values based on the experiment

3Important point about eventsIf the event A, B, C covers the entire possible outcome in the experiment. Then,
4Impossible eventThe probability of an event (U) which is impossible to event occur is O. Such an event is called an impossible event P (U) = O
5Sure, or certain eventThe probability of an event (X) which is sure (or certain) event to occur is 1. Such an event is called a sure event or a certain event

P (X) = 1

6Probability of any eventProbability of any event can be as