**Traffic Violations**

Using the data in Exercise 3-30, find Q_1, Q_2, and Q_3.

Step-by-Step

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**Step 1** Arrange the data in order from lowest to highest.

\begin{gathered}9 &12 &15 &16 &18 &19 &20 &22 &24 &25 \end{gathered}

**Step 2** Find the median Q_2.

\begin{gathered}\begin{gathered}9 &12 &15 &16 &18 &19 &20 &22 &24 &25 \\&&&&&\uparrow \end{gathered}\\ \quad \mathrm{MD}=\frac{18+19}{2}=18.5\end{gathered}

**Step 3** Find the median of the data values below 18.5.

\begin{gathered}9 \quad 12 \quad 15 \quad 16\quad 18 \\ \uparrow \\ Q_1=15 \end{gathered}

**Step 4** Find the median of the data values greater than 18.5.

\begin{gathered} 19 \quad 20 \quad 22 \quad 24 \quad 25\\ \uparrow \\ Q_3=22 \end{gathered}

Hence, Q_1=15, Q_2=18.5, and Q_3=22.

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