A stock's return has the following distribution: Demand for the Company's Products Probability of This Demand Occurring Rate of Return if This Demand Occurs (%) Weak 0.09 –46.50% Below average 0.18 –10.00% Average 0.36 16.00% Above average 0.21 22.95% Strong 0.16 51.15%
Calculate the stock’s standard deviation or returns.