SCENARIO 4-8 According to the Record of the Registrar's Office at a at a State

Short Answer

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,what is the probability that a randomly selected student is a junior or senior who lives in a dormitory?