Mathematics, 06.12.2019 02:31, Braxton12

Thirty-five sophomores, 69 juniors and 24 seniors are randomly selected from 461 sophomores, 328 juniors and 558 seniors at a certain high school.
a. simple random sample (srs)
b. systematic
c. stratified
d. convenience

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Thirty-five sophomores, 69 juniors and 24 seniors are randomly selected from 461 sophomores, 328 jun...