How many days in advance do travelers purchase their airline tickets? Below are data showing the advance days for a sample of 28 passengers on United Airlines Flight 815 from Chicago to Los Angeles.
(a) Calculate the mean, median, mode, and midrange.
(b) Calculate the quartiles and midhinge. 

(c) Why can't you use the geometric mean for this data set?

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11 7 4 15 14 7 29 8716 28 17 249 0 20 77 18 14 3 5 52 20 0 99 21 3