Instruction 2.9
A sample of 200 students at a large university was taken after the final exam to ask them whether they went out on the weekend before the exam or spent the weekend studying, and whether they did well or poorly on the exam. The following table contains the result.
$$\begin{array} { | l | l | l | }
\hline & \text { Did Well on Exam } & \text { Did Poorly on Exam } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went out on the weekend } & 30 & 70 \
\hline
\end{array}$$
-Referring to Instruction 2.9,of those who did well on the exam in the sample,_________ % of them went out on the weekend before the exam.
A) 30
B) 50
C) 15
D) 27.27

Question

Instruction 2.9
A sample of 200 students at a large university was taken after the final exam to ask them whether they went out on the weekend before the exam or spent the weekend studying, and whether they did well or poorly on the exam. The following table contains the result.
 $$\begin{array} { | l | l | l | } 
\hline & \text { Did Well on Exam } & \text { Did Poorly on Exam } \
\hline \text { Studying for Exam } & 80 & 20 \
\hline \text { Went out on the weekend } & 30 & 70 \
\hline
\end{array}$$
-Referring to Instruction 2.9,of those who did well on the exam in the sample,_________ % of them went out on the weekend before the exam.
A) 30
B) 50
C) 15
D) 27.27

Quizplus · Accepted Answer

According to the table, 66 students did well on the exam and of those, 18 went out on the weekend before the exam. Therefore, (18/66) x 100 = 27.27% of those who did well on the exam went out on the weekend before the exam.

Instruction 2 -Referring to Instruction 2