Your eccentric Aunt Claudia has left you $50,000 in BP shares plus $50,000 cash. Unfortunately, her will requires that the BP stock not be sold for one year and the $50,000 cash must be entirely invested in one of the stocks shown below. eBook BHP Billiton References BP Siemens Nestl Sony Sanofi Agricultural Bank Standard deviation, & Agricultural BHP Billiton 1.00 BP Siemens Nestl Sony Sanofi Bank 0.44 0.21 -0.05 Y 0.21 0.15 0.24 1.00 0.40 0.24 0.27 0.36 0.27 1.00 0.26 0.33 0.29 0.21 1.00 0.34 0.27 -0.06 1.00 0.27 0.35 1.00 0.17 1.00 26.2 22.8 22.5 13.6 27.6 17.5 25.5 a. Calculate the portfolio variance for seven different portfolios. Note: Use decimals, not percents, in your calculations. Do not round Intermediate calculations. Enter your answers as a decimal rounded to 5 places. b. What is the safest attainable portfolio under these restrictions? Complete this question by entering your answers in the tabs below. Required A Required B Calculate the portfolio variance for seven different portfolios. Note: Use decimals, not percents, in your calculations. Do not round Intermediate calculations. Enter your answers as a decimal rounded to 5 places.