According to a study, a cup of coffee contains an average of 119 milligrams (mg) of caffeine, with the amount per cup ranging from 60 to 194 mg. Suppose you want to repeat the experiment in order to...

Extracted text: According to a study, a cup of coffee contains an average of 119 milligrams (mg) of caffeine, with the amount per cup ranging from 60 to 194 mg. Suppose you want to repeat the experiment in order to obtain an estimate of the mean caffeine content in a cup of coffee correct to within 7 mg with 90% confidence. How many cups of coffee would have to be included in your sample? The experiment must sample cups of coffee in order to estimate the mean caffeine content in a cup of coffee correct to within 7 mg with 90% confidence. (Round up to the nearest whole number.)