A company that manufacturers coffee for use in commercial machines monitors the caf- feine content in its coffee. The company selects 50 samples of coffee every hour from its pro- duction line and determines the caffeine content. From historical data, the caffeine content (in milligrams, mg) is known to have a normal distribution with ^s 5 7.1 mg. During a 1-hour time period, the 50 samples yielded a mean caffeine content of y 5 110 mg.