Question 9 Note the frequency of two-wheelers, three-wheelers and four-wheelers going past during a time interval, in front of your school gate. Find the probability that any one vehicle out of the total vehicles you have observed is a two-wheeler.
Class 9 - Math - Probability Page 285
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:
After observing in front of the school gate from time interval 6:30 to 7:30 A.M the respective frequencies of different types of vehicles are:
Two wheelers =550
3 wheelers= 250
Four wheelers=80
The total number of vehicles = 550 + 250 + 80 = 880
Number 0f two wheelers=550
Hence, probability of observing two wheelers=number of two wheelers/total number of vehicles= 550/880=5/8
Probability of observing two wheelers, P(2 Wheelers)= 5/8
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Hope this will help you...
Answer:
Lets assume a case:
Number of 2 wheelers passed =18
Number of 3 wheelers passed =23
Number of 4 wheelers passed =19
The time interval is 15 minutes for all the 3 conditions.
Total number of vehicles passed = Number of 2 wheelers + Number of 3 wheelers + Number of 4 wheelers
=18+23+19=60
Probability that one vehicle out of total vehicles is 2 wheelers =
60
18
=
10
3
Step-by-step explanation: