Expected Return, Variance, Std. Deviation and Cofficient of Variation: Magee Inc.'s manager believes that economic conditions during the next year will be strong, normal, or weak, and she thinks that the firm's returns will have the probability distribution shown below. What's the standard deviation of the estimated returns?

State of the Economy Probability of State Occuring Stocks Expected Return

Boom 30% 22.05%

Normal 55% $15.45

Reccession 15% 20.05%

Answer is either:

a). 14.71

b). 13.53

c). 11.77

d). 10.00

e). 12.94