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} Verify that V(X + Y)= V(X)+ V(Y).Did you expect this result? Why?
Definitions:
Cost of Equity Capital
The return that investors require for an investment in a company's equity, reflecting the compensation for taking on equity risk.
Rate of Return
The gain or loss on an investment over a specified period, expressed as a percentage of the investment’s cost.
Earnings Multiple
A financial metric used to evaluate the relative value of a company, determined by dividing the company's stock price by its earnings per share.
Risk Differences
The variations in risk between investments, often considered in the context of portfolio management and investment analysis.
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