20. Consider the following information on profit expectations and the probabilities of their occurrence. Profits ($000) 250 250 350 400 600 650 Probabilities 0.10 0.15 0.25 0.25 0.15 0.10 The standard deviation of profit expectations is: A) B) C) D E) 135.92. 143.37. 147.73. 151.39. None of the above