If you eat in at a fast-food restaurant, most of the soda machines are self-serving. If you finish your drink, you can go back and fill up your cup as many times as you want. A local fast-food restaurant manager is concerned that people are taking advantage of filling up their drink and that the restaurant is losing money as a result. He selected a random sample of 90 customers who got a drink and are eating in the restaurant. He found that 19 of those customers are filling up more than 3 times