Thirty companies comprise the DJIA. Just how big are these companies? One common method for measuring the size of a company is to use its market capitalization, which is computed by multiplying the number of stock shares by the price of a share of stock. On March 14, 2014, the market capitalization of these companies ranged from Traveler’s $ 29.1 billion to ExxonMobil’s $ 403.9 billion. The entire population of market capitalization values is stored in DowMarketCap.
a. Compute the mean and standard deviation of the market ­capitalization for this population of 30 companies.
b. Interpret the parameters computed in (a).

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