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
1 727 761 788 790
2 767 780 761 774
3 776 786 737 767

What is the value of xx

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