Question: A junior engineer has to build a sample mean chart for the machines making Oreo cookies. He knows from numerous previous samples that this service

A junior engineer has to build a sample mean
A junior engineer has to build a sample mean chart for the machines making Oreo cookies. He knows from numerous previous samples that this service life of the cream injectors is normally distributed with a mean of 760 hours and a standard deviation of 41.5 hours. In the last three weeks, he tested the service life on random samples of four production runs with these results: Sample Hours 1 749 763 753 756 2. 783 772 759 757 3 750 786 774 767 What is the value of x? (Keep one decimal place) Your

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