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Given the Following Process Control Data for a Normally Distributed

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Given the following process control data for a normally distributed quality variable (three samples of size four each):
Given the following process control data for a normally distributed quality variable (three samples of size four each): If the process is known to have a mean of 15 and a standard deviation of 3,what are the three sigma upper and lower control limits for an x-bar chart? If the process is known to have a mean of 15 and a standard deviation of 3,what are the three sigma upper and lower control limits for an x-bar chart?

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