Quarterly enrollments in business statistics class for three years are shown in the table below.Compute the four-quarter centered moving averages. 
Definitions:
Complementary Pricing
A pricing strategy where products that complement each other are sold together at a price lower than the sum of their individual prices.
Prestige Pricing
A pricing strategy where the price is set higher than average to create a perception of exclusivity and high quality, appealing to status-conscious consumers.
Skimming Strategy
A pricing strategy involving setting high prices initially and then lowering them over time.
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