Consider four survivors on an island. 
Which of the following pairs of survivors has a double-coincidence of wants?
Definitions:
Central Tendency
A statistical measure that identifies the middle or central value of a data set, represented by mean, median, or mode.
Resale Value
The future value at which an asset can be sold, based on its depreciation or appreciation over time.
Automobiles
Automobiles are motor vehicles with wheels designed primarily for the transportation of people rather than goods.
Regression Equation
A mathematical equation that allows prediction of one behavior when the score on another variable is known.
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