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?
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Cell Phone Company
A business entity that provides services and products related to mobile communications, including handset sales, network connectivity, and customer service.
Data Usage Plan
A billing arrangement with a telecommunications or internet provider specifying the amount of data that can be used for a certain fee.
Frequency
The rate at which an event or transaction occurs over a particular period of time.
Frequent Shopper
A customer who regularly purchases from the same retailer or brand, potentially benefiting from loyalty programs or discounts.
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