Preston, Inc.'s stock has a 20% chance of producing a 48% return, a 50% chance of producing an 8% return, and a 30% chance of producing a -29% return.What is the firm's standard deviation of return?Note:Enter your answer rounded off to two decimal points.Do not enter % in the answer box.For example, if your answer is 0.12345 or 12.345%, then enter as 12.35 in the answer box