The returns on Relnvest Ltd. and GEM Inc. stocks over the past five months are as follows: Relnvest Ltd GEM Inc January 15% -3% February -3% 3% March 8% 4% April -1% 13% May -4% -2% a. Calculate the standard deviation of the returns of each stock. b. Calculate the standard deviation of the returns of a portfolio that invests in both stocks equally each month. c. Which stock is least risky if held on its own? Is the standard deviation of your portfolio returns smaller or higher than the standard deviation of this stock? What is the underlying reason to this

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Risk and return

Before understanding the concept of Risk and Return in Financial Management, understanding the two-concept Risk and return individually is necessary. 

Capital Asset Pricing Model

Capital asset pricing model, also known as CAPM, shows the relationship between the expected return of the investment and the market at risk. This concept is basically used particularly in the case of stocks or shares. It is also used across finance for pricing assets that have higher risk identity and for evaluating the expected returns for the assets given the risk of those assets and also the cost of capital.