Please help find the standard deviations

Consider the following two stocks. robabilities (Pi) Stock "A 9% 196 12% tock "B" ecessiOn -37% 11% 73-27% 896 The portfolio weights for stocks "A" and "B" are 0.15 and 0.85, respectively. What are the expected returns of stock "A" and "B"? Enter your answers as a percentage. Do not put the percent sign in your answers. Round your answers to 2 DECIMAL PLACES E(ra)0.37 Correct response: .37 E(rb)6.73 Correct response: 6.73 Using the correct answers from the previous question, what are the standard deviations of stocks "A" and "B? Enter your answers as a percentage. Do not put the percent sign in your answers. Round your answers to 2 DECIMAL PLACES. SDa Number SD-Number