TABLE 3-3 The Ordered Array Below Represents the Number of Vitamin Supplements

Short Answer

TABLE 3-3
The ordered array below represents the number of vitamin supplements sold by a health food store in a sample of 16 days.
19, 19, 20, 20, 22, 23, 25, 26, 27, 30, 33, 34, 35, 36, 38, 41
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 Table 3-3, the first quartile of the number of vitamin supplements sold in this sample is ________.