please find standard deviation for both Stock A and B

You have a portfolio with a standard deviation of 23% and an expected return of 18%. You are considering adding one of the two stocks in the following table. If after adding the stock you will have 20% of your money in the new stock and 80% of your money in your existing portfolio, which one should you add? Stock A Stock B Expected Return 13% 13% Standard Deviation 22% 17% Correlation with Your Portfolio's Returns Standard deviation of the portfolio with stock A is 0.2 0.7 $% (Round to two decimal places.)