A stock will have a loss of 14.2 percent in a recession, a return of 12.9 percent in a normal economy, and a return of 2

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A stock will have a loss of 14.2 percent in a recession, a
return of 12.9 percent in a normal economy, and a return of 27.6
percent in a boom. There is 27 percent probability of a recession,
30 percent probability of normal economy, and 43 percent
probability of boom. What is the standard deviation of the stock's
returns?