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Rajshahi Higher Secondary 2017 P4

Posted: Mon Feb 18, 2019 7:44 pm
by samiul_samin
Your city has $2$ types of people: Statistics show that the people with private cars are responsible for traffic jam in $40%$ of cases, whereas other people are responsible in only $20%$ of cases. Imagine in your city $40%$ people have private car. Now if one person in responsible for traffic jam then what is the probability of having a private car?

Re: Rajshahi Higher Secondary 2017 P4

Posted: Wed Apr 10, 2019 10:55 am
by SA'AD
In case of 60 persons causing traffic jams, people with private cars that cause this are 40 in number.
In case of 1 person causing traffic jam, people with private cars that cause this are 40/60 in number.
=2/3 no. of people.
So the probability must be= 2/(3*40) =1/60 [ANS]