1. The percentage of couples where both parties are in the labor force is 52.1. Choose 5 couples at random. Find the probability that

a. None of the couples have both persons working

b. More than 3 of the couples have both persons in the labor force

c. Fewer than 2 of the couples have both parties working

2. Is this a binomial distribution? Explain.

 X 0 1 2 3 

P(X) 0.064 0.288 0.432 0.216

3. The probabilities are 0.50, 0.40, and 0.10 that a trailer truck will have no violations, 1 violation, or 2 or more violations when it is given a safety inspection by state police. If 5 trailer trucks are inspected, find the probability that 3 will have no violations, 1 will have 1 violation, and 1 will have 2 or more violations.

4 . A telephone soliciting company obtains an average of 5 orders per 1000 solicitations. If the company reaches 250 potential customers, find the probability of obtaining at least 2 orders.

5 . A bookstore owner examines 5 books from each lot of 25 to check for missing pages. If he finds at least 2 books with missing pages, the entire lot is returned. If, indeed, there are 5 books with missing pages, find the probability that the lot will be returned.