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Suppose that an independent study of middle-level managers employed at companies located in Atlanta, Georgia, was conducted to compare the salaries of managers working at firm in Atlanta to the salaries of middle-level managers across the nation. The following data show the salary, in thousands of dollars, for a sample of 15 middle-level managers employed at companies in the Atlanta area. 108, 83, 106, 73, 53, 85, 80, 63, 67, 75, 124, 55, 93, 118, 77 Compute the mean annual salary.