The U.S. Federal Highway Administration conducts studies on motor vehicle travel by type of vehicle. Results are published annually in Highway Statistics. A sample of 15 cars yields the following data on number of miles driven, in thousands, for last year.

a. Obtain and interpret the quartiles.
b. Determine and interpret the interquartile range.
c. Find and interpret the five-number summary.
d. Identify potential outliers, if any.
e. Construct and interpret a boxplot.

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13.2 13.3 9 5.7 11.3 12.2 16.7 10.7 3.3 13.6 14.8 9.6 16 8.7 15.0