SOB 324 [Threshold]
Use the stem and leaf diagram to find the interquartile range of the data. There are 28 values.
\[\begin{array}{c|cc}
0 & 0&5\\
1 & 1\\
2 & 3&4&5&7\\
3 & 1&1&2&6&8&8\\
4 & 0\\
5 & 3&4&9\\
6 & 1&3&6\\
7 & 0&9\\
8 & 3&5&8\\
9 & 1&7&9\\
\end{array}\]
\[\text{Lower quartile} = 30.0\\
\text{Upper quartile} = 72.25\\
\text{Interquartile range} = 42.25\]