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An article suggests the lognormal distribution as a model for

`SO_(2)`

concentration above a certain forest. Suppose the parameter values are

`\mu =1.8`

and

`\sigma =1.2`

(a) What are the mean value and standard deviation of concentration? (Round your answers to three decimal places.) mean 6.770 standard deviation 22.305 (b) What is the probability that concentration is at most 10 ? Between 5 and 10 ? (Round your answers to four decimal places.) at most 10 0.8753 between 5 and 10 You may need to use the appropriate table in the Appendix of Tables to answer this question.