A stock will have a loss of 14.7 percent in a recession, a return of 13.4 percent in a normal economy, and a return of 28.1 percent in a boom. There is 22 percent probability of a recession, 25 percent probability of normal economy, and 53 percent probability of boom. What is the standard deviation of the stock's returns?

Bcorporation, a merchandising company, reported the following results for october: sales $ 490,000 cost of goods sold (all variable) $ 169,700 total variable selling expense $ 24,200 total fixed selling expense $ 21,700 total variable administrative expense $ 13,200 total fixed administrative expense $ 33,600 the contribution margin for october is: