Final answer:
The atomic mass of titanium represents the weighted average mass of all the naturally occurring isotopes of titanium.
Step-by-step explanation:
The atomic mass of titanium represents option 4, which is the weighted average mass of all the naturally occurring isotopes of titanium. Atomic mass is the weighted average mass of the isotopes present in a natural sample of the element. In the case of titanium, its atomic mass of 47.88 atomic mass units is calculated by taking into account the masses and relative abundances of its different isotopes.