At the end of December 2012 you bought and held through the end of 2022 a portfolio consisting of 30% Apple and 70% Verizons stock. A. Compute the average monthly return and standard deviation of returns for the above portfolio. B. Vary the proportion of Apple from -2 to 2 in increments of 0.2 and use the Data Table feature to compute the average monthly return and standard deviation of these portfolios. C. Plot the portfolio average return against the standard deviation.