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:
Sex Chromosomes
Pair of chromosomes that differs between males and females, and the difference determines sex.
Climate Change
Long-term alteration in average weather patterns, potentially due to natural phenomena or human activities.
Gender Ratio
The numerical or proportional distribution of individuals according to gender within a population.
Hershey-Chase Experiments
Seminal experiments conducted by Alfred Hershey and Martha Chase in 1952 that helped to confirm DNA as the genetic material in bacteriophages.
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