Weighted average — Science definition
An average in which each value is multiplied by how common it is, so more abundant values count more.
Where it is taught
- Isotopes & Average Atomic Mass — Atoms, Electrons & Periodicity, Physical Science: Chemistry, Grade 11
In use
The listed value is not the mass of any one atom — it is the average atomic mass, a weighted average of the masses of all the element's naturally occurring isotopes, weighted by how common each one is.
Isotopes & Average Atomic Mass