The class results on a mathematical quiz are shown in the table below. Find the average number of incorrect answers on the quiz.
$\begin{array} { | c | c | }
\hline \begin{array} { c }
\text { Total number } \
\text { of incorrect } \
\text { answers on } \
\text { the quiz }
\end{array} & \begin{array} { c }
\text { Number } \
\text { of students }
\end{array} \
\hline 0 & 4 \
\hline 1 & 4 \
\hline 2 & 8 \
\hline 3 & 10 \
\hline 4 & 1 \
\hline
\end{array}$
A) 2
B) 5.4
C) 9
D) 1.8

Question

The class results on a mathematical quiz are shown in the table below. Find the average number of incorrect answers on the quiz.
$\begin{array} { | c | c | } 
\hline \begin{array} { c } 
\text { Total number } \
\text { of incorrect } \
\text { answers on } \
\text { the quiz }
\end{array} & \begin{array} { c } 
\text { Number } \
\text { of students }
\end{array} \
\hline 0 & 4 \
\hline 1 & 4 \
\hline 2 & 8 \
\hline 3 & 10 \
\hline 4 & 1 \
\hline
\end{array}$
A) 2
B) 5.4
C) 9
D) 1.8

Quizplus · Accepted Answer

The average number of incorrect answers on the quiz is (0*4 + 1*4 + 2*8 + 3*10 + 4*1) / (4 + 4 + 8 + 10 + 1) = 2.

The Class Results on a Mathematical Quiz Are Shown in the Table