What is the expected standard deviation of stock A's returns based on the information presented in the table? Outcome Probability of outcome Stock A return in outcome Good 16% 64.00% Medium 47% 10.00% Bad "?" -42.00% 36.81% (plus or minus 0.02 percentage points) 27.10% (plus or minus 0.02 percentage points) 33.90% (plus or minus 0.02 percentage points) 31.30% (plus or minus 0.02 percentage points) The expected standard deviation can not be estimated be