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. The numbers are shown below. Given that an accident involved multiple vehicles, what is the probability that it involved alcohol? (as a fraction) Number of Vehicles Involved Did Alcohol Play a Role? 3 or more 20 1 Totals Yes 59 91 170 No Totals 23 180 27 230 82 271 47 400

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