The following data give the number of times the metal detector was set off by passengers at a small airport during 15 consecutive half-hour periods on February 1, 2012.

a. Calculate the three quartiles and the interquartile range. Where does the value of 4 lie in relation to these quartiles?
b. Find the (approximate) value of the 60th percentile. Give a brief interpretation of this value.
c. Calculate the percentile rank of 12. Give a brief interpretation of this value.

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7 2 12 13 15 3 0 8 10 5 14 204