SCENARIO 4-8
According to the record of the registrar's office at a state university,35% of the students are freshman,25% are sophomore,16% are junior and the rest are senior.Among the freshmen,sophomores,juniors and seniors,the portion of students who live in the dormitory are,respectively,80%,60%,30% and 20%.
-Referring to Scenario 4-8,if a randomly selected student does not live in the dormitory,what is the probability that the student is a junior or a senior?
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