What can we infer, at least roughly, from a star's luminosity class?

Question

Quizplus · Accepted Answer

A star's luminosity class is determined by its size, specifically its radius. The different luminosity classes (I-V) correspond to different size categories, with supergiants being the largest and dwarfs being the smallest. Therefore, we can infer at least roughly a star's size (radius) from its luminosity class. The other options (mass, age, surface temperature) are not solely determined by luminosity class and depend on other factors such as spectral type and color.

What Can We Infer, at Least Roughly, from a Star's