The average mass of an adult man is 76-83Kg (168-183 lbs).
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The average atomic mass is the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon-12. It is, the mass of an atom of the substance, rescaled so that carbon-12 would have a mass of 12.
A metre is 3 feet 3 inches. The average height of a grown man is around 1.7 meters. A meter is defined as the distance light travels in a vacuum in 1⁄299,792,458 of a second.
The average atomic mass of an element is the average of the atomic masses of its isotopes (that is a weighted average). You have to take into account the abundance of each isotope when they do your averaging.
What is weighted average atomic number
65.39amu