How to find the weights of the minimum-risk portfolio invested in AAPL-APPLE and SPDR GOLD SHARES-GLD. Period: January 01, 2015-Dec.31, 2015. Please show steps. Hint: the square of the risk of a portfolio with weight w in AAPL and weight 1 – w in GLD is a quadratic function of the form f (w)= aw2 +bw + c where a,b, c are numerical values to be computed.