Sample means and ranges were obtained for five samples of 10 units per sample from a production process.Assume the process was considered to be in control during the period these samples were collected.The results are as follows: 
What is the central line of the X chart for this process
Definitions:
Individual Differences
Variations among individuals in their psychological traits, behaviors, and physiological responses.
Nature
The physical world and everything in it that is not made by humans, including plants, animals, landscapes, and other features or products of the earth.
Organization
An arranged and structured collective of people with a particular purpose, such as a business or government department.
Public Service Motivation
The inclination or desire to contribute to the well-being of society through work in the public sector or through voluntary service.
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