1.

a. Estimate the standard deviation of KOs (i.e. Coca-Colas common stock) monthly returns using data from Jan. 1, 2015 to Dec. 31, 2019. This data can be obtained from Yahoo finance. Enter your answer as a percent without the %. Round your final answer to two decimals.

b. Using the data from Jan. 1, 2015 to Dec. 31, 2019, estimate the standard deviation of the monthly returns of a portfolio consisting of one share of KO, one share of T, and one share of XOM. Do not maintain constant portfolio weights each month. This data can be obtained from Yahoo finance. Enter your answer as a percent without the %. Round your final answer to two decimals.