Multiple Choice: Select the best answer.

Exercises 9 and 10 refer to the following setting. At the Census Bureau website www.census.gov, you can view detailed data collected by the American Community Survey. The following table includes data for 10 people chosen at random from the more than 1 million people in households contacted by the survey. "School" gives the highest level of education completed.

\begin{tabular}{|c|c|c|c|c|c|}
\hline
\textbf{Weight (lb)} & \textbf{Age (years)} & \textbf{Travel to work (min)} & \textbf{School} & \textbf{Gender} & \textbf{Income last year (\$)} \\
\hline
187 & 66 & 0 & Ninth grade & 1 & 24,000 \\
\hline
158 & 66 & n/a & High school grad & 2 & 0 \\
\hline
176 & 54 & 10 & Assoc. degree & 2 & 11,900 \\
\hline
339 & 37 & 10 & Assoc. degree & 1 & 6,000 \\
\hline
91 & 27 & 10 & Some college & 2 & 30,000 \\
\hline
155 & 18 & n/a & High school grad & 2 & 0 \\
\hline
213 & 38 & 15 & Master's degree & 2 & \\
\hline
194 & 40 & 0 & High school grad & 1 & 800 \\
\hline
221 & 18 & 20 & High school grad & 1 & 2,500 \\
\hline
193 & 11 & n/a & Fifth grade & 1 & 0 \\
\hline
\end{tabular}