How do you answer this in steps

Question

On another planet, the isotopes of titanium have the given natural abundances.

Isotope Abundance Mass (u)

46Ti 74.500% 45.95263

48Ti 15.200% 47.94795

50Ti 10.300% 49.94479

What is the average atomic mass of titanium on that planet?

average atomic mass = u

Answer 1

The average atomic mass is the weighted average of the individual isotopes.

(0.745 x 45.95263) + (0.152 x 47.94795) + (0.103 x 49.94479) = 34.2347 + 7.2881 + 5.1443

average mass = 46.667