What is the estimated population standard deviation of the following data? 
Definitions:
Herfindahl Indexes
A measure used to calculate the level of concentration in a market, indicating the competitive environment and potential for monopolistic power.
Four-Firm Concentration Ratio
A measure that indicates the total market share held by the largest four firms in an industry, used to assess the level of competition.
Product Differentiation
Product differentiation is the process of distinguishing a product or service from similar offerings in the market to make it more attractive to a particular target market.
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