The element X has two naturally occuring isotopes.  The mass…

The element X has two naturally occuring isotopes.  The masses (amu) and % abundances of the isotopes are given in the table below:   Isotope      Abundance (%)       Mass (amu)     39X 93.3 38.9637 41X 6.70 40.9618 What is the average atomic mass (amu) of element X?