with stocks apple, johnson and johnson, walt disney and exon mobile from the years $12-1-2013$ to $11-1-2023$

$1.$ Download monthly data for the last ten years for the four stocks from Yahoo! Finance. $(5\%)$

$2.$ Calculate monthly average returns, monthly excess returns, standard deviations and Sharpe

Ratios for the four stocks for the entire period. Use the adjusted close field to calculate returns.

$(10\%)$

T$-$bill rates can be accessed through Yahoo! Finance using the symbol $^$IRX