The file Tax contains the quarterly sales tax receipts (in $thousands) submitted to the comptroller of the Village of Fair Lake for the period ending March 2013 by all 50 business establishments in that locale:

a. Compute the mean, variance, and standard deviation for this population.
b. What percentage of the 50 businesses has quarterly sales tax receipts within ±1, 2, or ±3 standard deviations of the mean?
c. Compare your findings with what would be expected on the basis of the empirical rule. Are you surprised at the results in (b)?

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