Chapter 4.2, Problem 29E

The number of civilians holding government jobs in various federal departments and their monthly payrolls for September 2012 arc given in Figure 4.65.

Department	Number of Civilian Workers	Monthly Payroll (thousands of dollars)
Department of Education	$4,244$	$33,855$
Department of Health and Human Services	$73,565$	$509,844$
Environmental Protection Agency	$17,942$	$143,263$
Department of Homeland Security	$187,665$	$1,175,220$
Department of the Navy	$193,169$	$786,772$
Department of the Air Force	$166,362$	$679,157$
Department of the Army	$236,824$	$740,897$

Figure 4.65 Figure 4.65 Monthly earnings for civilian jobs (September 2012).

Source: U.S. Office of Personnel Management.

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.