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

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is in control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each If he uses upper and lower control limits of 22 and 18 ounces, on what day(s), if any, does this process appear to be out of control? Monday Tuesday Monday and Tuesday Monday, Tuesday, and Thursday None

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