A Quality Analyst wants to construct a sample mean chart for controlling a packaging process.He knows from past experience that whenever this process is under control,package weight is normally distributed with a mean of twenty ounces and a standard deviation of two ounces.Each day last week,he randomly selected four packages and weighed each with the following results: 
What is the sample mean package weight for Thursday?
Definitions:
Ceremonial Marriage
A marriage conducted with formal procedures, often involving religious or traditional rituals.
Polygyny
A form of marriage in which a man is allowed to have more than one wife simultaneously.
Polyandry
A type of matrimony where a woman is simultaneously married to multiple men.
Biological Family
The family into which a person is born, consisting of direct blood relatives.
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