Sam's portfolio has two securities. The Pfizer stock has an expected return of 20% and a standard deviation of 11%. The Moderna stock has an expected return of 1% and a standard deviation of 17%. If the correlation between Pfizer and Moderna stocks is 1, what is the lowest possible standard deviation that Sam's portfolio can have? Answer in percentage points and include four decimal places; do not include the ' % ' in your answer, e.g., 10.1234 would be entered if the answer was 10.1234%. You do not need to input trailing zeros. Your