Q2 of 32 Page 25

Define an elementary event.

In probability theory, an elementary event (also called an atomic event or simple event) is an event which contains only a single outcome in the sample space.


Using set theory terminology, an elementary event is a singleton.


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14

Given below is the frequency distribution of wages (in Rs.) of 30 workers in a certain factory :























Wages (in Rs.)



110-130



130-150



150-170



170-190



190-210



210-230



230-250



No. of


workers



3



4



5



6



5



4



3



A worker is selected atr random. Find the probability that his wages are :


(i) less than Rs. 150


(ii) at least Rs. 210


(iii) more than or equal to 150 but less than Rs. 210.

 1

Define a trial.

 3

Define an event.

 4

Define probability of an event.