When I put 5.13% as my standard deviation it said it was incorrect, if possible could you also answer the standard deviation for Common Stock B as well? Thank you!

(Expected rate of return and risk) Syntex, Inc. is considering an investment in one of two common stocks. Given the information that follows, which investment is better, based on the risk (as measured by the standard deviation) and return? Common Stock A Common Stock B Return Return Probability 0.20 0.60 0.20 10% 17% 20% Probability 0.10 0.40 0.40 0.10 -6% 7% 15% 21% a. Given the information in the table, the expected rate of return for stock A is 16.20 %. (Round to two decimal places.) The standard deviation of stock A is 5.13 %. (Round to two decimal places.)