Answer:
The population in this study is the entire students at UH
Explanation:
A population is a set of events or items of interest for the experiment or research. Since she wishes to determine the average amount of money a student of UH spend on lunch, then the population the researcher wishes to make this decision from is the entire students at this school.
The first 100 students leaving the student center after 12:00 is a subset of the entire population, which means this first 100 students are the sample she wishes to draw from the entire population of students at UH. This sample was probably chosen for some reason best known to the researcher and the nature of his/her research.