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Normal probability distribution Assuming that the rates of return associated with a given asset investment are normally distributed; that the expected return, r, is 12.3%; and that the coefficient of variation, CV, is 0.85, answer the following questions: Find the standard deviation of returns, sigma r. Calculate the range of expected return outcomes associated with the following probabilities of occurrence: 68%, 95%, 99%. The standard deviation of returns, sigma r is (Round to three decimal places.) The lowest possible expected return associated with the 68% probability of occurrence is %. (Round to two decimal places.) The highest possible expected return associated with the 68% probability of occurrence is %. (Round to two decimal places.) The lowest possible expected return associated with the 95% probability of occurrence is %. (Round to two decimal places.) The highest possible expected return associated with the 95% probability of occurrence is %. (Round to two decimal places.) The lowest possible expected return associated with the 99% probability of occurrence is %. (Round to two decimal places.) The highest possible expected return associated with the 99% probability of occurrence is %. (Round to two decimal olaces.')