Exhibit 6-20 
-Refer to Exhibit 6-20. If D, D' and D'' represents the demand curves for the only three consumers in a market, then the market quantity demanded at a price of $15 will be:
Definitions:
Probability Density Function
A function that describes the relative likelihood for a continuous random variable to take on a given value.
Smooth Curve
A continuous, gently bending line without sharp angles or disruptions, often used in graphing data or in mathematical functions.
Total Area
The sum of all the specific areas within a boundary, often referring to the total surface area covered by a two-dimensional shape or land parcel.
Poisson Distribution
A probability distribution that measures the probability of a given number of events happening in a fixed interval of time or space.
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