The amount of caffeine in a sample of five-ounce servings of brewed coffee is shown in the histogram. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. Click the icon to view the histogram. Complete the table. Round values to the nearest tenth as needed. f Midpoint x 70.5 xf Graph/chart 30- 25- 20- 15- 12 10- 5- 3 25 25 7 3 0+ 48.5 70.5 92.5 114.5 136.5 158.5 [ Print Done