Consider a stock that may produce the various possible returns for the next year:

	Probability	Stock Return
Scenario 1	0.2	20%
Scenario 2	0.15	19%
Scenario 3	0.5	-5%
Scenario 4	0.15	23%

Calculate the standard deviation (σ) of the return on the stock.

Round your answer to the nearest 0.1% and enter your answer as a percentage. For example, if your answer is 12.3%, enter 12.3