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Consider the following three state of the worlds (bad, average, and good) and the performance for CD Return, Government Bonds, and Stocks.

State	CD Return	Bond Return	Stock Return
1. Good	2%	4%	15%
2. Average	2%	3%	7%
3. Bad	2%	1%	-5%

Goldman Sachs projects for next year the likelihood of a good state is 40%, the likelihood of an average state is 45%, and the likelihood of a bad state is 15%.

What is the standard deviation of the return for Stocks? (round to two digits, e.g. 5.18%)