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A study was conducted on the production rates for a company that produces tractor wheels. The table below shows the number of wheels made during 11 consecutive one-hour production periods.<br/><br/>$\begin{tabular}{|c|c|} \hline<br/>**One-** & **Number** \\<br/>**hour** & **wheels** \\<br/>**period** & **made** \\ \hline A & 24 \\ \hline B & 24 \\ \hline C & 21 \\ \hline D & 21 \\ \hline E & 21 \\ \hline F & 19 \\ \hline G & 24 \\ \hline H & 24 \\ \hline I & 19 \\ \hline J & 22 \\ \hline K & 23 \\ \hline \end{tabular}$<br/><br/>What is the range of the number of wheels made for the 11 one-hour periods?