There is a 20% chance we will get a 16% return, a 30% chance of getting a 12% return, a 40% chance of getting a 8% return, and a 10% chance of getting an 4% return. The standard deviation for the above investment would be: (Round to the nearset hundredth percent. Answer in the percent format. Do not include % sign in your answer (i.e. If your answer is 4.33%, type 4.33 without a % sign at the end.))