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:
Three Dimensions
Describes an object or environment that has width, depth, and height, offering a sense of physical realism.
Axis
A reference line drawn in a graph or chart that defines a scale of measurement for data.
Frequency Distributions
A statistical representation, often in the form of a table or graph, showing how often each different value occurs in a set of data.
Class Width
The difference between the upper and lower boundaries of any class (category) in a frequency distribution.
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