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:
Stockholders' Equity
The residual interest in the assets of a corporation after deducting liabilities, also known as shareholders' equity.
Balance Sheet
A financial statement that summarizes a company's assets, liabilities, and shareholders' equity at a specific point in time, showing the balance of income and expenditure over the preceding period.
Assets Decrease
Assets decrease refers to a reduction in the total value of a company’s assets, which can result from factors like asset sales, depreciation, or impairments.
Cost of Goods Sold
The direct financial outlays for making the goods a company offers for sale, including the cost of materials and labor.
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