Weekly iPhones sales (in $1,000s)in an Apple store for the past three months are shown in the table below.Compute the four-week centered moving averages. 
Definitions:
Necessary Features
are essential characteristics or components required for something to be recognized or function in a certain way.
Sufficient Features
Characteristics or aspects that are adequate or enough to meet the needs of a situation or to fulfill a criterion.
Brain Activation
A process involving increased blood flow and neural activity in specific areas of the brain in response to various tasks or stimuli.
Nouns
Words that name people, places, things, or ideas.
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