I sometimes post my old exams, and I think that these would be more useful as reference documents if the grade table on the front page reported the average score for each question (from the year that the exam was given). My goal is to add an extra "Average" column to the standard grade table.
I have created a MWE that gets something close to what I want by hijacking the bonus points mechanism (which I don't use). The issue is that I would like to be able to "assign bonus points" (record the average score) for a regular question, rather than adding a separate part for this as I have done in the MWE
\documentclass[addpoints]{exam}
\begin{document}
% Rename "Bonus Points" entry in grade tables
\bvpword{Average} % Vertical Bonus Tables
\bhpword{Average} % Horizontal Bonus Tables
\cvbpword{Average} % Combined Vertical Tables
\chbpword{Average} % Combined Horizontal Tables
% Combined point table
\combinedpointtable
% Questions
\begin{questions}
\question
\begin{parts}
\part[20] Why?
\bonuspart[15] Dummy part to indicate that the average score on this question was 15
\end{parts}
\question
\begin{parts}
\part[20] Why not?
\bonuspart[15] Dummy part to indicate that the average score on this question was 15
\end{parts}
\end{questions}
\end{document}
Is there an easy way of assigning bonus points to regular questions, or a better way of recording the average score within the exam class?