The National Climate Data Center gave the accompanying annual rainfall (in inches) for Medford, Oregon, from 1950 to 2008 (www.ncdc.noaa.gov/oa/ climate/research/cag3/city.html):

a. Compute the quartiles and the interquartile range.
b. Are there outliers in this data set? If so, which observations are mild outliers? Which are extreme outliers?
c. Draw a boxplot for this data set that shows outliers.

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28.84 20.15 18.88 25.72 16.42 20.18 28.96 20.72 23.58 10.62 20.85 19.86 23.34 19.08 29.23 18.32 21.27 18.93 15.47 20.68 23.43 19.55 20.82 19.04 18.77 19.63 12.39 22.39 15.95 20.46 16.05 22.08 19.44 30.38 18.79 10.89 17.25 14.95 13.86 15.30 13.71 14.68 15.16 16.77 12.33 21.93 31.57 18.13 28.87 16.69 18.81 15.15 18.16 19.99 19.00 23.97 21.99 17.25 14.07