When data consist of percentages, ratios, growth rates, or other rates of change, the geometric mean is a useful measure of central tendency. For n data values the geometric mean, assuming all data values are positive, is as follows. To find the average growth factor over 5 years of an investment in a mutual fund with growth rates of 8.9% the first year, 12.4% the second year, 14.2% the third year, 4.4% the fourth year, and 6.7% the fifth year, take the geometric mean of 1.089, 1.124, 1.142, 1.044, and 1.067. Find the average growth factor of this investment. (Round your answer to four decimal places.)