SCENARIO 4-2
An alcohol awareness task force at a Big-Ten university sampled 200 students after the midterm to
ask them whether they went bar hopping the weekend before the midterm or spent the weekend
studying, and whether they did well or poorly on the midterm. The following result was obtained. $$\begin{array} { | l | l | l | }
\hline & \text { Did Well on Midterm } & \text { Did Poorly on Midterm } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went Bar Hopping } & 30 & 70 \
\hline
\end{array}$$
-Referring to Scenario 4-2, what is the probability that a randomly selected student did well on the midterm and also went bar hopping the weekend before the midterm?
A) 30/200 or 15%
B) (80+30)/200 or 55%
C) (30+70)/200 or 50%
D) (80+30+70)/200 or 90%

Question

SCENARIO 4-2
An alcohol awareness task force at a Big-Ten university sampled 200 students after the midterm to
ask them whether they went bar hopping the weekend before the midterm or spent the weekend
studying, and whether they did well or poorly on the midterm. The following result was obtained. $$\begin{array} { | l | l | l | } 
\hline & \text { Did Well on Midterm } & \text { Did Poorly on Midterm } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went Bar Hopping } & 30 & 70 \
\hline
\end{array}$$
-Referring to Scenario 4-2, what is the probability that a randomly selected student did well on the midterm and also went bar hopping the weekend before the midterm?
A) 30/200 or 15%
B) (80+30)/200 or 55%
C) (30+70)/200 or 50%
D) (80+30+70)/200 or 90%

Quizplus · Accepted Answer

The probability of doing well on the midterm and going bar hopping is the number of students who did both divided by the total number of students. From the table, we see that 30 students did both, and there were a total of 200 students. So the probability is 30/200 = 15%.

SCENARIO 4-2 an Alcohol Awareness Task Force at a Big-Ten

SCENARIO 4-2
an Alcohol Awareness Task Force at a Big-Ten