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Shader Storage Technologies produces refrigeration units for food producers and retail food establishments. The overal average temperature that thee...

Shader Storage Technologies produces refrigeration units for food producers and  retail food establishments.  The overal average temperature that thee units maintain is 43 degrees fahrenheit.  The average range is 5 degrees fahrenheit.Sample of 12 are taken to monitor the process.  Determine the upper and lower control chart limits for averages and ranges for these refrigeration units. 

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