P(soph) = .25
P(non dorm soph) = (1-.60)
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
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 freshman, sophomores, juniors and seniors, the portion of the students who live in the dormitory are respectively 80%, 60%,30% and 20%. What is the probability that a randomly selected student is a sophomore who does not live in a dormitory? Show your answer is obtained.
1 answer