AstraZeneca is the maker of the stomach medicine Prilosec, which is the second-best-selling drug in the world. Recently, the company has come under close scrutiny concerning the cost of its medicines. The company’s internal audit department selected a random sample of 300 purchases for Prilosec. They wished to characterize how much is being spent on this medicine. In the sample, the mean price per 20-milligram tablet of Prilosec was $2.70. The sample had a standard deviation of $0.30. Determine an estimate that will characterize the average range of values charged for a tablet of Prilosec.