# Precious metals

In 2006-2009, the value of precious metals changed rapidly. The data in the following table represent the total rate of return (in percentage) for platinum, gold, an silver from 2006 through 2009:

Year Platinum Gold Silver

2009 62.7 25.0 56.8

2008 -41.3 4.3 -26.9

2007 36.9 31.9 14.4

2006 15.9 23.2 46.1

a. Compute the geometric mean rate of return per year for platinum, gold, and silver from 2006 through 2009.

b. What conclusions can you reach concerning the geometric mean rates of the three precious metals?

Year Platinum Gold Silver

2009 62.7 25.0 56.8

2008 -41.3 4.3 -26.9

2007 36.9 31.9 14.4

2006 15.9 23.2 46.1

a. Compute the geometric mean rate of return per year for platinum, gold, and silver from 2006 through 2009.

b. What conclusions can you reach concerning the geometric mean rates of the three precious metals?

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