The article “Reliability of Domestic-Waste Biofilm Reactors” (J. of Envir. Engr. 1995: 785–790) suggests that substrate concentration (mg/cm3) of influent to a reactor is normally distributed with µ = 0.30 and σ = 0.06.
a. What is the probability that the concentration exceeds .25?
b. What is the probability that the concentration is at most .10?
c. How would you characterize the largest 5% of all concentration values? (That is find the 95-th