According to www.money-zine.com, the average FICO score in the United States was around 692 in December 2011. Suppose the following data represent the credit scores of 22 randomly selected loan applicants.

a. Calculate the values of the three quartiles and the interquartile range. Where does the value 617 falls in relation to these quartiles?
b. Find the approximate value of the 30th percentile. Give a brief interpretation of this percentile.
c. Calculate the percentile rank of 533. Give a brief interpretation of this percentile rank.

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494 728 468 533 747 639 430 690 604 422 356 805 749 600 797 702 628 625 617 647 772 572