Question: A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that package weight is normally

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that package weight is normally distributed with a mean of 20 ounces and a standard deviation of 2 ounces. Each day last week, he randomly selected 4 packages and weighed each. If he builds a 2-sigma x-bar chart, what would be the upper control limit?

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