Need Standard Deviation

ook Expected Return: Discrete Distribution A stock's return has the following distribution: Demand for the Probability of This Rate of Return if This Company's Products Demand Occurring Demand Occurs (%) Weak 0.1 -40% Below average 0.2 -8 Average 0.4 6 Above average 0.2 30 Strong 0.1 60 1.0 Calculate the stock's expected return and standard deviation. Do not round intermediate calculations. Round your answers to two decimal places. Expected return: 8.8 % Standard deviation: %