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

Multiple Choice

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