In Six Sigma methodology, what does the term variation refer to?

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In Six Sigma methodology, what does the term variation refer to?

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	A Greek letter that signifies the measurements of variability in a process.
	A collection of related, structured, and ordered activities that produce a product or service which meets customer requirements.
	The changes or fluctuations within a process that determine how stable a process is.
	The time to complete a process from start to finish with actual time worked and wait times.