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A sandwich shop owner takes a daily sample of five consecutive sandwich orders at a random time during the lunch rush and records the time it takes to complete cach order. Past experience indicates that the process mean should be μ = 82 seconds, and the process standard deviation should be σ 22 seconds. Calculate the center line and control limits for an x control chart. (Round your answers to two decimal place CL = LCL sec sec

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Answer #1

The formula of control limits for x bar chart are:

Control limit(CL) = μ = 82 sec

Lower Control Limit(LCL) = μ-3 * 82-3 * -= 52.48 sec Vn

2 Upper Control Limit(UCL) = μ + 3 *-= 82 + 3 *-= 111.52 sec Vn

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