Construct a 3-sigma x-bar chart for the length in centimeters of a part from the following table.What is the upper control limit? 
Definitions:
Unknown Quantities
Variables in mathematical equations or problems that are yet to be determined or solved for.
Unknown Quantity
A value in mathematics or science that is not initially known but is sought through problem-solving.
Proportion
A portion, fraction, or quantity of something as it relates to the entirety.
Unknown Quantity
A variable or value in a mathematical equation or problem that is not known but can be solved for using given information.
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