Mothers Against Drunk Driving (MADD) is a very visible group whose main focus is to educate the ...

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Mothers Against Drunk Driving (MADD) is a very visible group whose main focus is to educate the public about the harm caused by drunk drivers. A study was recently done that emphasized the problem we all face with drinking and driving. Five hundred accidents that occurred on a Saturday night were analyzed. Two items noted were the number of vehicles involved and whether alcohol played a role in the accident. The numbers are shown below:
                                                         Number of Vehicles Involved
Did alcohol play a role?   1   2   3
Yes   60   110   30   200
No   40   215   45   300
    100   325   75   

Given that multiple vehicles were involved, what proportion of accidents involved alcohol?
 
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