Mercury is a persistent and dispersive environmental contaminantfound in many ecosystems

Chapter 1, Problem 35

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Mercury is a persistent and dispersive environmental contaminantfound in many ecosystems around the world.When released as an industrial by-product, it often finds itsway into aquatic systems where it can have deleteriouseffects on various avian and aquatic species. The accompanyingdata on blood mercury concentration (mg/g) for adultfemales near contaminated rivers in Virginia was read froma graph in the article Mercury Exposure Effects theReproductive Success of a Free-Living TerrestrialSongbird, the Carolina Wren (The Auk, 2011: 759769;this is a publication of the American Ornithologists Union). .20 .22 .25 .30 .34 .41 .55 .561.42 1.70 1.83 2.20 2.25 3.07 3.25a. Determine the values of the sample mean and samplemedian and explain why they are different.[Hint: ox1 = 18.55.]b. Determine the value of the 10% trimmed mean andcompare to the mean and median.c. By how much could the observation .20 be increasedwithout impacting the value of the sample median?