What is the Sd for B? Please show me the solution, thanks

Consider the following information: Rate of Return if State Occurs State of Economy Recession Normal Boom Probability of State of Economy .35 .40 .25 Stock A .06 .09 13 Stock B -.15 . 16 .36 a. Calculate the expected return for the two stocks. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) Answer is complete and correct. 8.95% Expected return for A Expected return for B 10.15% b. Calculate the standard deviation for the two stocks. (Do not round your intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) Answer is complete but not entirely correct. Standard deviation for A Standard deviation for B 2.67% 20.89 X %