The file RadioShack 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:

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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