Q1 of 32 Page 25

Define a trial.

Any particular performance of a random experiment is called a trial.


By Experiment or Trial in the subject of probability, we mean a Random experiment unless otherwise specified.


Each trial results in one or more outcomes.


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13

The following table gives the life time of 400 neon lamps:























Life time


(in hrs.)



300-400



400-500



500-600



600-700



700-800



800-900



900-1000



No. of lamps



14



56



60



86



74



62



48



A bulb is selected at random. Find the probability that the life time of the selected bulb is:


(i) less than 400


(ii) between 300 to 800 hours


(iii)at least 700 hours.

 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.

 2

Define an elementary event.

 3

Define an event.