The average atomic mass of element X is 14.007 u.
The average atomic mass of X is the weighted average of the atomic masses of its isotopes.
We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its % abundance).
Thus,
0.996 36 × 14.003 u =13.952 03 u
0.003 64 × 15.000 u = 0.054 60 u
__________TOTAL = 14.007 u
