Calculate the expected return on stock of Gamma Inc.:

State of the economyProbability of the statesPercentage returnsEconomic recession29%-3.1%Steady economic growth 31%4.8%BoomPlease calculate it12.5%

and then calculate the expected standard deviation of this Gamma Inc. stock below.

State of the economyProbability of the statesPercentage returns Economic recession 29%3% Steady economic growth24%5% BoomPlease calculate it18%