TABLE 17-7 A Supplier of Silicone Sheets for Producers of Computer Chips

Short Answer

TABLE 17-7
A supplier of silicone sheets for producers of computer chips wants to evaluate her manufacturing process. She takes samples of size 5 from each day's output and counts the number of blemishes on each silicone sheet. The results from 20 days of such evaluations are presented below.
-Referring to Table 17-7, an R chart is to be constructed for the number of blemishes. The lower control limit for this data set is ________.