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 value should be used as the mean of the sampling distribution of sample means?
Definitions:
Stimulant Drugs
Substances that increase alertness, attention, and energy by enhancing the activity of the central nervous system.
Hallucinogenics
Drugs that give rise to hallucinations.
Social Conventions
Established norms, behaviors, and rules that govern interactions within a society or group, facilitating social harmony and order.
Conventional Thought
A cognitive process that follows traditional or societal norms, often characterized by conformity and a tendency to accept established practices.
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