63 Radioactive lichen. Refer to the University of Alaska study to monitor the level of radioactivity in lichen, presented in Exercise 36 . The amount of the radioactive element cesium-137 (measured in microcuries per milliliter)

for each of nine lichen specimens is repeated in the following table and saved in the LICHEN file:

a. Find the mean, median, and mode of the radioactivity levels.

b. Interpret the value of each measure of central tendency calculated in part a .

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Location Bethel Eagle Summit 5.50 5.00 4.15 4.85 Moose Pass - 6.05 Turnagain Pass - 5.00 Wickersham Dome - 4.10 - 4.50 - 4.60 Based on Lichen Radionuclide Baseline Research Project, 2003, p. 25. Orion, University of Alaska-Fairbanks.