Mothers Against Drunk Driving (MADD) is a highly visible group whose main focus

Question

Mothers Against Drunk Driving (MADD) is a highly visible group whose main focus is to the public about the harm caused by drunk drivers. A study was done recently that emphasized the we all face with drinking and driving. Four hundred accidents that occurred on a Saturday night were. Two items noted were the number of vehicles involved and whether alcohol played a role in the. Study results are shown below. What proportion of accidents involved alcohol and a single vehicle? A. 25/400 B. 50/400 C. 195/400 D. 245/400 What proportion of accidents involved alcohol or a single vehicle? A. 25/400 B. 50/400 C. 195/400 D. 245/400 Given alcohol was involved, what proportion of accidents involved a single vehicle? A. 50/170 B. 120/170 C. 50/70 D. 120/400 Given that multiple vehicles were involved, what proportion of accidents involved alcohol? A. 120/325 B. 120/275 C. 120/230 D. 120/170

Explanation / Answer

19 ) number of vehicles with alcohol and single vehicle is 50 . total vehicles are 400

so proportion is 50/400

20 ) here note the OR condition

so alcohol involved vehicles are 170 , single vehicles are 75 , so 170+75 = 245 , so the total proportion is 245/400

21 ) given alcohol was involved , so consider the "yes" row .. now proportion of single vehicle are than 50/170

22 ) muliple vehicles are for 2 and 3 , so total vehicles for alcohol and multiple vechiles are

100+20 = 120 , total multiple vehicles are 275+50 = 325 so the proportion is

120/325

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