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:
Intraspecific
Pertaining to interactions or relationships occurring within the same species, such as competition or mating.
Negative Feedback
A regulatory mechanism in which a stimulus causes an opposite output in order to maintain an optimal level of whatever is being regulated.
Density Dependent
Factors whose effects on the size or growth of the population vary with the population density.
Fecundity
The potential capacity of an individual to produce offspring.
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