A quality analyst wants to construct a sample mean chart for controlling a packaging process.He knows from past experience that the process standard deviation is two ounces.Each day last week,he randomly selected four packages and weighed each.The data from that activity appears below. 
(a)Calculate all sample means and the mean of all sample means.
(b)Calculate upper and lower control limits that allow for natural variations.
(c)Is this process in control?
Definitions:
Pasture Lands
Areas of land covered with grass or other vegetation suitable for grazing by livestock.
Letter of Requisition
A formal written request, often used in official or professional settings, to demand the provision of goods, services, or information.
Formal Demand
A formal request, usually in writing, requiring a person or entity to fulfill a legal obligation or payment.
Payment
The act of transferring money or its equivalent in exchange for goods or services.
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