Probability of An Event


 
 
Concept Explanation
 

Probability of An Event

Probability: It predicts the chance of occuring an event.The value lies between 0 and 1. If an event is sure to happen then the probability will be 1 and if an event is impossible to happen then the the probabity of occurance is 0..

small Probability = frac{No ;of; favourable; Outcomes}{Total; number; of; events}

Example 1: We have balls number 1 to 9. What is the probability of picking an even numbered ball.

Sol: Total number of possible outcomes= 9 as there are 9 balls.

Total Number of favourable cases = 2,4,6,8 Numberd ball is picked. Therefore the number of favourable  cases is 4

small P(Even; Numbered; ball) = frac{4}{9}

Sample Questions
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Question : 1

In a class there are 7 boys and 9 girls. A student is selected at random for a scholarship. The probability that student is a girl is

Right Option : A
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Explanation
Question : 2

The sum of probabilities of all the possible outcomes of an event is always

Right Option : C
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Explanation
Question : 3

In a bag there 5 books on Maths, 6 books on English and 7 books on Science. Amit picks up a book without looking at it. The probability that its a science book is

Right Option : C
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Explanation
 
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