What are the advantages and limitations of randomized control trials?

Though risk assessment is commonly used in decision-making in many environmental related problems, its effectiveness is affected by uncertainty involved intrinsically with this method. Elaborate the major sources for uncertainty in risk assessment.

The long-term average October precipitation in Syracuse is 3.36 inches, with a standard deviation of 1.48 inches. Assuming a normal distribution. What is the probability that less than 1.0 inches of precipitation will occur in any October? Show your work. What is the probability that more than 5.0 inches will occur? Show your work. Draw a labeled sketch to show what area of the normal distribution curve you used to solve the problem.

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