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 iPhones sold daily.
Definitions:
School-age Child
Refers to children typically between the ages of 5 and 12 years, who are attending elementary or primary school.
Adolescent
A stage of human development occurring between childhood and adulthood, typically between ages 13 and 19, characterized by significant physical, psychological, and social changes.
Dairy Products
Foods produced from the milk of mammals, such as cheese, yogurt, and butter, often high in calcium and other nutrients.
Grains
Refers to small, hard seeds, especially the seeds of various food plants like wheat, corn, rice, and barley, a staple component of many diets globally.
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