Asked by John

How is an average mass different from a weighted average mass?
Answered by bobpursley
Weighted means there is a percent abundance given to each constituent isotope.
Answered by drwls
Suppose you are computing an average for a number of type of masses. They might be isotopes in this case. A weighted average would take into account how much of each isotope is there. A "plain" average would just be an average mass for the various n types. (i.e., add them up and divide by n)
Answered by john
what you mean by N type?
Answered by bobpursley
N, as in number of constituents, ie, the number of isotopes in the natural element.
Answered by drwls
N is the number of types of things or substances you are averaging. In the case of an isotope mixture of an element, it would be the number of isotopes
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