1.The article "Reliability of Domestic-Waste Biofilm Reactors" (J. of Envir. Engr., 1995: 785-790) suggests that substrate concentration of influent to a reactor is normally distributed with u What is the probability that the concentration = 0.3 and o = 0.06. a. exceeds .25? b. is at most .10? c. lies between 0.15 and 0.35?

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