SCENARIO 4-1
Mothers Against Drunk Driving Is a Very Visible

SCENARIO 4-1
Mothers Against Drunk Driving is a very visible group whose 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.The numbers are shown below: $$\begin{array} { c | c c c | c } & { \text { Number of Vehicles involved } } \\\text { Did alcohol play a role? } & \mathbf { 1 } & \mathbf { 2 } & \mathbf { 3 } & \text { Totals } \\\hline \text { Yes } & 50 & 100 & 20 & 170 \\\text { No } & 25 & 175 & 30 & 230 \\\hline \text { Totals } & 75 & 275 & 50 & 400\end{array}$$
-Referring to Scenario 4-1, given that alcohol was not involved, what proportion of the accidents were single vehicle? a) $50 / 75$ or $66.67 \%$
b) $25 / 230$ or $10.87 \%$
c) $50 / 170$ or $29.41 \%$
d) $25 / 75$ or $33.33 \%$