Question 7 To know the opinion of the students about the subject statistics, a survey of 200 students was conducted. The data is recorded in the following table.
Opinion Number of students
like 135
dislike 65
Find the probability that a student chosen at random
(i) likes statistics,
(ii) does not like it
Class 9 - Math - Probability Page 284
Answers
Probability is the study of the chances of events happening.
Event:
A Possible outcome or combination of outcomes is called event.
The probability of happening our event always lies from 0 to 1.
The sum of all the probabilities of all possible outcomes of an experiment is 1.
Required probability=number of trials in which the event E has happened/Total number of trials
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Solution:
Total number of students = 135 + 65 = 200
(i) Numbers of students who like statistics = 135
Required probability,P(statistics)= 135/200 = 27/40
(ii) Numbers of students who does not like statistics = 65
Required probability,P(not like statistics) = 65/200 = 13/40
P(statistics)= 27/40
P(not like statistics) = 65/200 = 13/40
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Hope this will help you....
1)The total number of students =200
=No.of students who like statistics /Total no.of students.
=135/200
==27/40
2)No of students wh does not like statistics /total no.of students
=65/200
=13/40
Hope it is helpful...