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 is calculated by multiplying each number of incorrect answers by the number of students, summing these products, and then dividing by the total number of students: $(0*4 + 1*4 + 2*8 + 3*10 + 4*1) / (4+4+8+10+1) = 2$.

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