Answer:
23%
Explanation:
Base on the scenario been described in the question, we can use following method to solve the given problem
The computation is shown below:
computing the standard deviation first we have to find out the variance which is shown below:
Variance = 70% Ă— (0.20 - 0.05)^2 + 30% Ă— Â (-0.30 - 0.05)^2
= 0.0525
Now
Standard Deviation is
= (0.0525)^(1 Ă· 2)
= 23%