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The concentration of nuclear waste (in ppm) in a disposal site follows a lognormal distribution with...

The concentration of nuclear waste (in ppm) in a disposal site follows a lognormal distribution with a log (base e) adjusted variance of 3.6. The probability that the concentration exceeds 350 ppm is 50%.

a) What is the 75th percentile concentration of nuclear waste?

b) What is the probability that the concentration will exceed 500 ppm?

Math   Statistics-And-Probability   
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