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} Determine the marginal probability distribution of Y.
Definitions:
Gastric Secretion
The process of producing and releasing fluids containing hydrochloric acid and digestive enzymes by the stomach lining.
Chyme
The fluid mixture of partially digested food and digestive secretions that is formed in the stomach and intestine during digestion.
Gastric Juices
A mixture of mucus, hydrochloric acid, and digestive enzymes produced by the stomach lining to aid in the digestion of food.
Bolus
A mass of chewed food at the moment of swallowing.
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