PCBs are a class of chemicals often found near the disposal of electrical devices. PCBs tend to concentrate in human fat and have been associated with numerous health problems. In the article “Some Other Persistent Organochlorines in Japanese Human Adipose Tissue”[Environ-mental Health Perspective (April, 2000) 108: 599—603], researchers examined the concentrations of PCB (ng/g) concentrations of PCB (ng/g) in the fat of a group of adults. They detected the following concentrations: 1
800, 1800, 2600, 1300, 520, 3200, 1700, 2500, 560, 930, 2300, 2300, 1700, 720
a. Determine the mean, median, and standard deviation.
b. Find the 25th, 50th, and 75th percentiles.
c. Plot the data in a boxplot.
d. Would it be appropriate to apply the Empirical Rule to these data? Why or why not?