Refer to the table below. Assume En. Ahmad held the portfolio consisting of 50% of Stock B and 50% of Stock V. Year Stock B's Return, rB Stock V's Return, rV 2017 -18% -14.5% 2018 33% 21.8% 2019 15% 30.5% 2020 -0.50% -7.6% 2021 27% 26.3% i. What would be the average return on the portfolio for the period of 2017-2021. ii. Calculate the standard deviation for the portfolio.