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An upper-level sociology class has 120 registered students: 34 seniors, 57 juniors, 22 sophomores and 7...

An upper-level sociology class has 120 registered students: 34 seniors, 57 juniors, 22 sophomores and 7 freshmen. 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 a junior?

What is the probability that the student will be a freshmen?

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 there be in the sample?

Math   Statistics-And-Probability   
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