Step 1: Write out the 8 numbers given in the question
[tex]18,21,24,26,30,32,35,35[/tex]Step 2: plot the boxplot using a calculator
Step 3: Identify the minimum value, the first quartile, the median, the third quartile, and the maximum value from the boxplot above
[tex]\begin{gathered} \min =18 \\ Q_1=22.5 \\ Q_2=28 \\ Q_3=33.5 \\ \max =35 \end{gathered}[/tex]Hence, the correct option is the third option