Transcript text: The table shows the number of cars sold per month at Lemon cars where $t$ is in weeks and $S(t)$ is the number of cars sold. Find the average change in number of cars sold between weeks 2 and 5 .
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline$t$ & 1 & 2 & 3 & 4 & 5 & 6 \\
\hline$S(t)$ & 24 & 15 & 12 & 23 & 24 & 23 \\
\hline
\end{tabular}
The average rate of change in the number of cars sold was $\square$ by $\square$ between weeks 2 and 5.
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