In 2008 through 2011, the value of precious metals fluctuated dramatically. The data in the following table represent the yearly rate of return (in percentage) for platinum, gold, and silver from 2008 through 2011:

a. Compute the geometric mean rate of return per year for platinum, gold, and silver from 2008 through 2011.
b. What conclusions can you reach concerning the geometric mean rates of return of the three precious metals?
c. Compare the results of (b) to those of Problem 3.21 (b).

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Year Platinumm Gold Silver 2011 21.1 10.2 -9.8 2010 21.5 29.8 83.7 2009 55.9 23.9 49.3 2008 -41.3 4.3 26.9