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 what proportion of accidents involved more than one vehicle?