1. The number of civilians holding government jobs in various federal departments and their monthly payrolls for September 2012 are given in Figure 4.65.
a. Which department or agency has the highest mean monthly earnings? What is the mean monthly earnings for this department or agency?
b. Which department or agency has the lowest mean monthly earnings? What is the mean monthly earnings for this department or agency?
c. Find the mean monthly earnings of all civilians employed by the Department of Education, the Department of Health and Human Services, and the Environmental Protection Agency.
d. Find the mean monthly earnings of all civilians employed by the Department of Homeland Security, the Department of the Navy, the Department of the Air Force, and the Department of the Army
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