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 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
1 755 746 784 757
2 790 772 757 755
3 777 761 779 755

What is the value of x

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