A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces. Then,once the machine is running,a sample of six tubes is taken every three hours and weighed with the following results: 
What is the upper control limit (UCL) for the mean?
Definitions:
Hemocytometer
A device used in laboratories to count cells, particularly red and white blood cells, in a blood sample.
Blood Cells
Cells that circulate in the blood, including red blood cells (for carrying oxygen), white blood cells (for fighting infections), and platelets (for blood clotting).
Calibrated
Adjusted or marked a device, tool, or system so its measurements agree with a standard or known measure.
Quality Assurance Program
A required program for clinical laboratories designed to monitor the quality of patient care, including quality control, instrument and equipment maintenance, proficiency testing, training and continuing education, and standard operating procedures documentation.
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