The atomic masses of the two stable isotopes of boron; boron-10 (natural abundance:19.78%) and boron-11 (natural abundance:80.22%) are 10.0129 amu and 11.0093 amu, respectively.  calculate the average atomic mass of boron
 10.41 amu
10.95 amu
10.81 amu 
10.72 amu 
10.13 amu