TABLE 3-4 The Ordered Array Below Represents the Number of Cargo Manifests

Short Answer

TABLE 3-4
The ordered array below represents the number of cargo manifests approved by customs inspectors of the Port of New York in a sample of 35 days:
16, 17, 18, 18, 19, 20, 20, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 25, 25, 26, 26, 26, 27, 28, 28, 29, 29, 31, 31, 32, 32
Note: For this sample, the sum of the values is 838, and the sum of the squared differences between each value and the mean is 619.89.
-Referring to Table 3-4, the interquartile range of the customs data is ________.