Final answer:
Red dwarfs are the most numerous star types in a large sample of stars.
Step-by-step explanation:
Based on the information provided, the most numerous star types in a large sample of stars are red dwarfs. Red dwarfs are low-mass stars that make up about 70% of all stars and dominate the census of stars within a certain distance of the Sun. Even though red dwarfs are the most common, they are faint and require a telescope to be detected.