The U.S. National Center for Health Statistics compiles data on the length of stay by patients in shortterm hospitals and publishes its findings in Vital and Health Statistics. A random sample of 21 patients yielded the following data on length of stay, in days.

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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4 4 12 18 9 6 12 3 6 15 7 3 55 1 10 13 57 1 23 9