As in Exercise 15, you’re phoning local businesses. You call three firms. What is the probability that all three are owned by women?

In Exercise 15

The 2000 Census showed that 26% of all firms in the United States are owned by women. You’re phoning local businesses, assuming that the national percentage is true in your area. You wonder how many calls you’ll have to make before you find one owned by a woman. What probability model should you use? (Specify the parameters as well.)