Mothers Against Drunk Driving 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. Four 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.

Given alcohol was involved, what proportion of accidents involved a single vehicle?

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Did alcohol play a role? # of vehicles involved 3 Totals 170 50 100 Yes 20 No 25 175 30 230 75 Totals 275 400 50