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.
After working for 10 to 20 years, Postal Service Mail Carriers make a median salary of $54K. Individuals who have achieved more than 20 years of experience don't seem to earn much more than people who have 10 to 20 years under their belts; the more senior group reports an average income of $56K.