please help answer this question

Return on A Return on B 20% 5% 10% 8% 8% 12% What is the standard deviation of a portfolio with 80% of the funds invested in A? State Boom Normal Bust O 3.9 O 3.3 O 3.1 Probability 20 O 3.7 O 3.5. 50 .30 Return on A Return on B 20% 5% 10% 8% 8% 12% What is the standard deviation of a portfolio with 80% of the funds invested in A? State Boom Normal Bust 3.9 O 3.3 3.1 O 3.7 O 3.5 Probability .20 .50 .30