A Quality Analyst wants to construct a control chart for determining whether three machines,all producing the same product,are under control with regard to a particular quality variable.Accordingly,he sampled four units of output from each machine,with the following results: 
What is the estimate of the process mean based on this limited number of samples?
Definitions:
Confabulation
The production of fabricated, distorted, or misinterpreted memories about oneself or the world, without the conscious intention to deceive.
Dementia
A category of brain diseases that cause a long-term and often gradual decrease in the ability to think and remember, affecting daily functioning.
Lewy Body
Abnormal aggregates of protein that develop inside nerve cells, contributing to Parkinson’s disease, Lewy body dementia, and other disorders.
Pick Disease
A rare neurodegenerative disease that causes progressive destruction of nerve cells in the brain, leading to changes in behavior, personality, and ultimately severe dementia.
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