Probability of An Event


 
 
Concept Explanation
 

Probability of An Event

Definition of Probability: 

Probability is considered as a branch of mathematics that deals with uncertainty. It has been developed out of practical considerations and is used in taking decisions in almost every field. For example, while going out of house on cloudy day we have to take decision whether we should carry an umbrella or not. Such type of decision is taken by taking into consideration the probability of the occurrence of the event.

Let n be the total number of trials and m  be the total number of trials in which the event has happened. The empirical probability P(E) of an event to occur is defined as:

P(E)=frac{Number ;of ;trials; in; which; the; event; happened}{The; total; number; of; trials}=frac{m}{n}

0leq mleq n;;Rightarrow 0leq frac{m}{n}leq 1;;Rightarrow 0 leq P(E)leq 1

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Sample Questions
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Question : 1

The record of a weather station shows that out of the past 300 days, its weather forecasts were correct 170 times. What is the probability that on a given day it was correct ?

Right Option : A
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Question : 2

In a basket there are 2 mangoes and 3 oranges. The probability that Param will pick up a mango is

Right Option : B
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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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