Portfolio risk and return

Cheyenne holds a $$7,500$ portfolio that consists of four stocks. Her investment in each stock, as well as each stock's beta, is listed in the following

table:

Suppose all stocks in Cheyenne's portfolio were equally weighted. Which of these stocks would contribute the least market risk to the portfolio?

Western Gas & Electric Co$.$

Makissi Corp.

Perpetualcold Refrigeration Co$.$

Tobotics Inc.

Suppose all stocks in the portfolio were equally weighted. Which of these stocks would have the least amount of stand$-$alone risk?

Makissi Corp.

Western Gas & Electric Co$.$

Perpetualcold Refrigeration Co$.$

Tobotics Inc.

If the risk$-$free rate is $4\%$ and the market risk premium is $5\mathrm{.}5\%,$ what is Cheyenne's portfolio's beta and required return? Fill in the following table:

Beta

Required Return

Cheyenne's portfolio