Three industrial engineers were assigned to monitor a certain process using X-control chart with n=9, and K=2. The in-control process mean and standard deviation are 14 and 6, respectively. The probability of having one point below the LCL equals 0.001350. Help in answering the following questions: A- Estimate the ARL. B- Estimate the ATS. C- What is the amount of shift per unit of standard deviation?

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