Final answer:
The subject of this question is Mathematics. The question involves counting the number of high school students in each classification (freshman, sophomore, junior, senior) based on a sample of 100 students.
Step-by-step explanation:
The subject of the given question is Mathematics. The question involves counting the number of high school students in each classification (freshman, sophomore, junior, senior) based on a sample of 100 students, where 25 students are selected from each classification. The goal is to determine the expected numbers of students in each classification.