| Stem | \multicolumn{8}{c}{Leaf} | |||||||
| 4 | $\circ$ | 1 | 1 | 3 | 4 | 5 | 8 | 9 |
| 5 | 1 | 2 | 2 | 4 | 6 | 7 | 8 | |
| 6 | $\circ$ | 2 | 3 | 3 | 4 | 6 |
\textbf{141--} We display two sets of inverted numerical data using a box plot. The difference between the medians of the inner data of each box is:
\begin{center}
\begin{tabular}{c|cccccccc}
Stem & \multicolumn{8}{c}{Leaf} \\
\hline
4 & $\circ$ & 1 & 1 & 3 & 4 & 5 & 8 & 9 \\
5 & 1 & 2 & 2 & 4 & 6 & 7 & 8 & \\
6 & $\circ$ & 2 & 3 & 3 & 4 & 6 & & \\
\end{tabular}
\end{center}
(1) $0.8$ \qquad (2) $0.9$ \qquad (3) $1$ \qquad (4) $1.1$