A new printing machine is set or calibrated to print 25 copies per minute. On each of four days, the printer's output is measured five times. The data will be used to construct a process control chart to monitor the printing process. The results of the printing process are in the following table. 
What is the value of A2, the control limit factor for averages?
Definitions:
Cost-benefit Analysis
A systematic approach to estimating the strengths and weaknesses of alternatives used to determine options that provide the best approach to achieve benefits while preserving savings.
Economic Project
A planned undertaking, typically with specific goals and financial frameworks, aimed at contributing to economic development or addressing economic issues.
Public Good
A good that is non-excludable and non-rivalrous, meaning it can be used by everyone and one person's use does not reduce availability to others.
Nongovernmental Organization
A nonprofit, voluntary citizens' group which is organized on a local, national or international level to perform a variety of service and humanitarian functions.
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