8. Portfolio risk and return Emma holds a $10,000 portfolio that consists of four stocks. Her investment in each stock, as well as each stocks beta, is listed in the following table: Stock Investment Beta Standard Deviation Perpetualcold Refrigeration Co. (PRC) $3,500 1.00 12.00% Tobotics Inc. (TI) $2,000 1.70 12.00% Water and Power Co. (WPC) $1,500 1.20 20.00% Mainway Toys Co. (MTC) $3,000 0.40 25.50% Suppose all stocks in Emmas portfolio were equally weighted. Which of these stocks would contribute the least market risk to the portfolio? Mainway Toys Co. Tobotics Inc. Water and Power Co. Perpetualcold Refrigeration Co. Suppose all stocks in the portfolio were equally weighted. Which of these stocks would have the least amount of stand-alone risk