The following data give the odometer mileage (rounded to the nearest thousand miles) for all 20 cars that are for sale at a dealership.

a. Calculate the values of the three quartiles and the interquartile range. Where does the number 77 fall in relation to these quartiles?
b. Find the approximate value of the 18th percentile. Give a brief interpretation of this percentile.
c. Calculate the percentile rank of 72. Give a brief interpretation of this percentile rank.

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50 43 62 84 27 38 28 48 86 86 58 72 40 27 40 90 43 94 36 77