The file Radio Shack contains the number of RadioShack stores located in each of the 50 U.S. states and the District of Columbia, as of December 31, 2013:652076535658268181230912724281971226856758133991151558147972833403615641342139920359702322069228840841161441113610119Source: Data extracted from “RadioShack closing up to 1,100 stores,” USA Today, March 6, 2014, p. 1B.
a. Compute the mean, variance, and standard deviation for this population.
b. What percentage of the 50 states have RadioShack stores within {1, {2, or {3 standard deviations of the mean?
c. Compare your findings with what would be expected on the ba-sis of the empirical rule. Are you surprised at the results in (b)?
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