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A junior engineer has to build a sample mean chart for the machines making Oreo cookies....

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
1 761 767 781 759
2 788 782 762 755
3 779 759 742 755

What is the value of x double bar (Keep one decimal place)

business   Operations-Management   
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