PERGUNTA 1

1. This is correct. Since the events “belongs to Middle Class” and “belongs to Upper Class” are disjoint, P(Middle or Upper)=P(Middle)+P(Upper)=.50+.21=.71
2. 
3. 
   
4. Apply probability rules in order to find the likelihood of an event
5. "Fill in the blank" question: select the correct answer.
6. Two U.S. adults are chosen at random.Let A be the event that the first adult belongs to the Middle ClassLet B be the event that the second adult belongs to the Lower class.
7. Complete the following sentences:
8. Events A and B are
9. .Events A and B are