Substrate concentration of influent (measured in mg/cm) to a reactor is normally

Question

Substrate concentration of influent (measured in mg/cm) to a reactor is normally distributed with mean 0.35 and standard deviation o.o5 What is the probability that the concentration exceeds 0.397? [Round to 4 significant digits after decimal] 0.1736 You are correct. Your receipt no. is 158-1393 Suppose we monitor substrate concentration of of the influent to the reactor thrice. What is the probability that the concentration exceeds 0.397 all three times? [Round to 4 significant digits after decimal] 0.1736 Submit Answer Incorrect. Tries l/5 Previous Tries What value characterize the largest 7% of all concentration values? Round to 3 significant digits after decimal] 0.424 You are correct Previous mes Your receipt no. is 158-1859

Explanation / Answer

Mean is 0.35 and s is 0.05

P(x>0.397)=P(z>(0.397-0.35)/0.05)=P(z>0.94) or 1-P(z<0.94)=1-0.8264=0.1736

For three times it is (0.1736)^3 =0.0052

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