McTree Inc.'s manager thinks that economic conditions during the next year will be strong, normal, or weak, and he thi

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McTree Inc.'s manager thinks that economic conditionsduring the next year will be strong, normal, or weak, and he thinks that the firm's returns will have the probabilitydistribution shown below. What's the standard deviation of theestimated returns? (Hint: Use the formula for the standarddeviation of a population, not a sample.) Do not roundyour calculations.
Prob.
Return
30%
40.0%
40%
10.0%
30%
-16.0%
​
24.75%
17.59%
21.71%
22.58%
25.18%