Quality and Quality Control

For each of the following cases, fi nd the CL, UCL, and LCL for an R chart based on the given information.

1. n = 9, x = 26.7, R = 5.3.
2. n = 17, x = 138.6, R = 15.1
3. n = 4, x = 84.2, R = 9.6.
4. n = 22, x = 8.1, R = 7.4.

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