Go to finance.yahoo.com and download monthly S\&P 500 index for the recent 5 years. 1- Create a line graph in excel where you put "monthly date" on x-axis and "closing price (adjusted)" on y-axis. 2- Compute monthly return (in percentage) and create a line graph in excel where you put "monthly date" on x-axis and "return" on y-axis. 3- Compute the average return and standard deviation for each year. a. Prepare a table with three columns. Put year in the first column, average return (in percentage) in the second column and standard deviation in the third column. b. Create two line graphs: - Graph of average return (put year on x-axis and average return on y-axis) - Graph of standard deviation (put year on x-axis and standard deviation on y-axis). In both graphs interpret the best and worst years