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# Thread: Marcel free pdf for exam p Q 9.13

1. ## Marcel free pdf for exam p Q 9.13

Hi everyone.
Problem 9.13
A study of drinking and driving has found that 40% of all fatal auto accidents
are attributed to drunk drivers, 1% of all auto accidents are fatal, and drunk
drivers are responsible for 20% of all accidents. Find the percentage of nonfatal
accidents caused by drivers who are not drunk.

Solution: I'm using a grid rows Fatal/Non Fatal, columns Drunk/Not Drunk to solve the above problem.But in my first grid i.e Fatal/ Drunk, I will be tempted to enter 0.4,but filling up the cells with total Fatal =0.01 that will yield negetive cell value for Fatal/Not Drunk. What's the logic of filling that cell with 0.4 times 0.01 =0.004.
From the question I can't connect the two as a product of 0.4 and 0.01.

Thanks.

2. Originally Posted by Dabsy
Hi everyone.
Problem 9.13
A study of drinking and driving has found that 40% of all fatal auto accidents
are attributed to drunk drivers, 1% of all auto accidents are fatal, and drunk
drivers are responsible for 20% of all accidents. Find the percentage of nonfatal
accidents caused by drivers who are not drunk.

Solution: I'm using a grid rows Fatal/Non Fatal, columns Drunk/Not Drunk to solve the above problem.But in my first grid i.e Fatal/ Drunk, I will be tempted to enter 0.4,but filling up the cells with total Fatal =0.01 that will yield negetive cell value for Fatal/Not Drunk. What's the logic of filling that cell with 0.4 times 0.01 =0.004.
From the question I can't connect the two as a product of 0.4 and 0.01.

Thanks.
Are you confusing P(A|B) vs. P(A n B)?

3. Maybe.
Why do we have to multiply 40% by 1% ?