Mobile Phones Sales
After analyzing sales data,the owner of a Mobile Phone store produced the following joint probability distribution of the number of iPhones (X)and Blackberries (Y)sold daily. 
-{Mobile Phones Sales Narrative} Find the marginal probability distribution of the number of Blackberries sold daily.
Definitions:
Auschwitz
A complex of concentration and extermination camps operated by Nazi Germany during World War II, located in occupied Poland, and the site of the largest mass murder in a single location in history.
Military Strategists
Individuals skilled in the planning and directing of military operations, often involved in developing tactics, strategies, and logistical plans for warfare.
Keynesian Economic
An economic theory advocating for government interventions to influence demand through fiscal and monetary policies.
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