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Problem 6. Assume that the concentration of Aldicarb (toxic substance) in non-contaminated sites is normally distributed...

Problem 6. Assume that the concentration of Aldicarb (toxic substance) in non-contaminated sites is normally distributed with Mean = 20 ppb and standard deviation = 4 ppb. a. What is probability that the concentration of Aldicarb in a non-contaminated site is between 30 and 50 ppb? b. 30% of the sites have less than X ppb of the concentration of Aldicarb. Calculate X.

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