Radioactive lichen. Refer to the University of Alaska study to monitor the level of radioactivity in lichen, presented in Exercise. 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:
Location |
|
|
|
Bethel | - 5.50 | - 5.00 |
|
Eagle Summit | - 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.
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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