Suppose analysts expected the following for the troubled BP over the oil spill crisis.

Scenarios Probability Return to investors

Bankruptcy $\mathrm{.}05-100\%$

Bounce back $\mathrm{.}1530\%$

Takeover $\mathrm{.}2020\%$

Muddling through $\mathrm{.}609\%$

What is the standard deviation?