A study concerning the relative influence of husbands and wives in consumer

purchasing, which appeared in recent issue of Time Magazine, reported that

husband exerts the primary influence in selecting the make of a new automobile

in about 70% of all new-car purchases by families. Suppose four families have

decided to buy a new car.

a. What is the probability that in exactly two of the four families the husband

will exert the primary influence in choosing the make of a car?

b. What is the probability that the husband will select the make of car in all four

families?

c. What is the probability that the husband will exert the primary influence in

choosing the make of a car in at least two of the seven families? Use Binomial Table given in

Appendix B (Text) for this section.