Consider the following frequency distribution: 
What is the midpoint of the first class?
Definitions:
Average Total Cost
The total cost of production (fixed plus variable costs) divided by the total quantity produced, typically graphed to analyze cost behaviors over varying output levels.
Average Total Cost
The total cost of production divided by the number of units produced, representing the cost per unit of output.
Marginal Revenue
The boost in income from the sale of an additional unit of a product or service.
Demand
The desire and willingness of consumers to purchase a particular good or service at various prices.
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