A vending machine that dispenses coffee into cups must fill the cups with 7.8 ounces of liquid. Before selling the machine to a college or business, the company tests the machine to be sure it dispenses an average of 7.8 ounces. A sample of 20 amounts is listed here: 7.78 7.79 7.82 7.82 7.87 7.84 7.80 7.82 7.80 7.78 7.83 7.75 7.85 7.83 7.84 7.73 7.82 7.87 7.81 7.88 Does the machine dispenses an average of 7.8 ounces per cup