Final answer:
The subject of this question is Probability, and the grade is High School. The question is about sampling methods and how probability sampling allows researchers to make generalizations about the larger population.
Step-by-step explanation:
In the given question, the subject is Probability and the GRADE is High School. The question describes a scenario where customers at are randomly selected and asked about their opinions of the service they received. This type of sampling is called probability sampling, where researchers choose samples at random from the larger population. It allows researchers to make generalizations about the larger population.