Instruction 4.2
An alcohol awareness task force at a large Australian university sampled 200 students after the final exam to ask them whether they went out to a pub on the weekend before the exam or spent the weekend studying, and whether they did well or poorly on the exam. The following result was obtained.
$$\begin{array} { | l | l | l | }
\hline & \text { Did Well on Exam } & \text { Did Poorly on Exam } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went to a pub } & 30 & 70 \
\hline
\end{array}$$
-Referring to Instruction 4.2,what is the probability that a randomly selected student did well on the exam and also went to a pub on the weekend before the exam?
A) 30/200 or 15%
B) (30 + 70) / 200 or 50%
C) (80 + 30 + 70) / 200 or 90%
D) (80 + 30) / 200 or 55%

Question

Instruction 4.2
An alcohol awareness task force at a large Australian university sampled 200 students after the final exam to ask them whether they went out to a pub on the weekend before the exam or spent the weekend studying, and whether they did well or poorly on the exam. The following result was obtained.
 $$\begin{array} { | l | l | l | } 
\hline & \text { Did Well on Exam } & \text { Did Poorly on Exam } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went to a pub } & 30 & 70 \
\hline
\end{array}$$
-Referring to Instruction 4.2,what is the probability that a randomly selected student did well on the exam and also went to a pub on the weekend before the exam?
A) 30/200 or 15%
B) (30 + 70) / 200 or 50%
C) (80 + 30 + 70) / 200 or 90%
D) (80 + 30) / 200 or 55%

Quizplus · Accepted Answer

The probability is calculated by dividing the number of students who did well on the exam and went to a pub (30) by the total number of students sampled (200), which equals 30/200 or 15%.

Instruction 4 -Referring to Instruction 4