Car Sales
The joint probability distribution of variables X and Y is shown in the table below.Rebecca and Rachel are car salespeople.Let X denote the number of cars that Rebecca will sell in a month,and let Y denote the number of cars Rachel will sell in a month. 
-{Car Sales Narrative} Develop the probability distribution of X + Y.
Definitions:
Deficit
An economic condition where expenditures exceed revenue.
Balance of Trade
The difference between a country's exports and imports of goods.
Imports
Goods or services brought into one country from another for sale or use.
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