The unordered array below represents the number of vitamin supplements sold by a health food store in a sample of 16 days. 22, 23, 25, 26, 19, 19, 20, 20, 27, 30, 33, 34, 35, 41, 36, 38 Note: For this sample, the sum of the values is 448, and the sum of the squared differences between each value and the mean is 812. Referring to Scenario 3-3, the range of the number of vitamin supplements sold in this sample is ________.