An Upper Level Sociology Class At A Large Urban University Has 120 Students Incl 1

An upper level sociology class at a large urban university has 120 students, including 34 seniors, 57 juniors, 22 sophomores, and 7 freshmen.

A) If you are asked to select a proportionate stratified sample of size 30 from the classroom, stratified by class level (senior, junior, etc…) How many students from each group will be there in the sample?

B) If instead you are to select a disproportionate sample size 20 from the classroom with equal number of students from each class level in the sample, how many freshmen will be there in the sample?