Quality and Quality Control

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

(a) n = 9, x = 26.7, R = 5.3. (b) n = 17, x = 138.6, R = 15.1. (c) n = 4, x = 84.2, R = 9.6. (d) n = 22, x = 8.1, R = 7.4

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