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.
The employer with the highest salaries for the profession was the Postal Services, with means of $26.08 per hour, or $54,250 per year. They were followed by information services such as archives and libraries. Rates here ran a mean $23.94 per hour, or $49,790 per year.