The mass of the body is found by simply weighing a person on a scale. The volume of the body is most easily and accurately determined by completely immersing a person in water and calculating the volume of water from the weight of water that is displaced (via underwater weighing).
Mailman Salary Statistics as of 2015. Average annual salary for a Mailman is $36600 based on statistics in the U.S. as of 2015. The highest salary recorded was $76765. The lowest salary reported was $15604. These figures will vary on a state to state basis as these are averages across all 50 states.
According to the American Postal Workers Union, clerks' salaries depended on their service grade. Level 3 employees in the lowest spot on the pay scale earned $25,657 to start. The bureau reported the nation's 65,040 postal clerks overall averaged $52,860, or $25.41 an hour.