20. Mercury Concentration in Dolphins Scientists are increasingly concerned with the buildup of toxic elements in marine mammals and the transfer of these elements to the animals’

offspring. The striped dolphin was the subject of one such study. The mercury concentrations (micrograms/

gram) in the livers of 28 male striped dolphins were as follows:

a. Calculate the five-number summary for the data.

b. Draw a box plot for the data.

c. Are there any outliers?

d. If you knew that the first four dolphins were all less than 3 years old, while all the others were more than 8 years old, would this information help explain the difference in the size of those four observations?
Explain.

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1.70 183.00 221.00 286.00 1.72 168.00 406.00 315.00 8.80 218.00 252.00 241.00 5.90 180.00 329.00 397.00 101.00 264.00 316.00 209.00 85.40 481.00 445.00 314.00 118.00 485.00 278.00 318.00