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

a)Imagine that you choose one random student from the classroom (perhaps by using a random number table) what is the probability that the student will be junior?

b)what is the probability that the student will be freshmen?

c)If you asked to select a proportionate stratified sample of size 30 from the classroom, stratified by class level ( senior, junior.ect) how many student from each will be in the sample?

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