Portfolio risk and return

Ariel holds a $$10,000$ 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 Ariel's portfolio were equally weighted. Which of these stocks would contribute the least market risk to the portfolio?

Makissi Corp.

Tobotics Inc.

Water and Power Co$.$

Andalusian Limited

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

Makissi Corp.

Andalusian Limited

Tobotics Inc.

Water and Power Co$.$

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