The table below has question-wise data on the performance of students in an examination. The marks for each question are also listed. There is no negative or partial marking in the examination.
$$\begin{array}{|c|c|c|c|c|} \hline \text{Q No} & \text{Marks} & \text{Answered Correctly} & \text{Answered Wrongly} & \text{Not Attempted} \\ \hline 1 & 2 & 21 & 17 & 6 \\ \hline 2 & 3 & 15 & 27 & 2 \\ \hline 3 & 2 & 23 & 18 & 3 \\ \hline \end{array}$$
What is the average of the marks obtained by the class in the examination?
- $1.34$
- $1.74$
- $3.02$
- $3.91$