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To run SPC in a process, a sample size of 4 observations are taken every day over 20 days. The Average of sample averages turns

To run SPC in a process, a sample size of 4 observations are taken every day over 20 days. The Average of sample averages turns out to be 5.00 and the average range is 2.3. What is the UCL for the xbar chart? Round to 2 decimals.
6.68
6.03
7.02
14.02

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