Answer
It is unlikely that these events are independent. In particular, it is reasonable to expect that younger adults are more likely than older adults to be college students.
Work Step by Step
In the book, you look at what they give.
8% adults full-time students
30% adults are 55 or older
you solve by multiplying:
$(.08)(.30)=.024$
2.4
It is obvious that younger students attend college after figuring out the percentage of adults aged 55 or older in college.
