The contents of 100 match boxes were checked to determine the number of matchsticks they contain...

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The contents of 100 match boxes were checked to determine the number of matchsticks they contained.
\begin{tabular}{|l|c|c|c|c|c|c|c|}
\hline Number of matches & 35 & 36 & 37 & 38 & 39 & 40 & 41 \\
\hline Number of boxes & 6 & 10 & 18 & 25 & 21 & 12 & 8 \\
\hline
\end{tabular}
Determine how many extra matchsticks should be added to the contents of these 100 boxes so as to bring mean up to exactly 39 matches.
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