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:
Optimistic Explanatory Style
Refers to a manner of explaining life events in a positive light, attributing good outcomes to personal abilities and bad outcomes to external factors.
Pessimistic Explanatory Style
The inclination to ascribe adverse occurrences to constant, inherent, and widespread factors.
Type A Personality
A personality type characterized by high levels of competitiveness, self-drive, impatience, and a constant sense of urgency.
Optimism
An inclination to maintain a hopeful and positive attitude towards the future or the successful outcome of an event.
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