=+4.25 ● ▼ The paper “Total Diet Study Statistics on Element Results” (Food and Drug Administration, April 25, 2000) gave information on sodium content for various types of foods. Twenty-six tomato catsups were analyzed.

Data consistent with summary quantities given in the paper were Sodium content (mg/kg)

12,148 10,426 10,912 9116 13,226 11,663 11,781 10,680 8457 10,788 12,605 10,591 11,040 10,815 12,962 11,644 10,047 10,478 10,108 12,353 11,778 11,092 11,673 8758 11,145 11,495 Compute the values of the quartiles and the interquartile range.