Annual growth rates for individual firms in the toy industry tend to fluctuate dramatically, depending on consumers€™ tastes and current fads. Consider the following growth rates (in percent) for two companies in this industry, Hasbro and Mattel.

a. Use the standard deviation to evaluate the variability for each firm.
b. Which company€™s growth rate had greater variability?

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Year Hasbro Mattel 2005 2006 20072008 2009 3.0 2.1 21.8 9.1 4.8 1.2 1.5 5.70.1 8.2