The following data give the total food expenditures (in dollars) for the past one month for a

Question:

The following data give the total food expenditures (in dollars) for the past one month for a sample of 20 families.
530 1234 595 427 716 1065 934 1630 1046 2199 1353 872 1480 699 1274 1187 441 1125 933 1127 a. Calculate the values of the three quartiles and the interquartile range.
b. Find the approximate value of the 57th percentile.
c. Calculate the percentile rank of 1046. Give a brief interpretation of this percentile rank.