A study recorded the blood mercury levels (inmicrograms per liter, ug/1) of 4134 pregnant British women enrolled in theAvon Longitudinal Study of Parents and Children.' The published findings include the following statement: "Blood mercury levels ranged from 0.17 to 12.8 pg/1. The 5th, 10th, 25th, 50th, 75th, 90th, and 95th percentiles were 0.81, 0.99, 1.35, 1.86, 2.52, 3.33, and 4.02 pg/1, respectively."What are the range and the interquartile range for this distribution