# The flow in a river can be modeled as a log-normal distribution. From the data, it was estimated that, the probability that the flow exceeds 821 cfs is 50% and the probability that it exceeds 100 cfs is 90%. Let X denote the flow in cfs in the river. What is the mean of log (to the base 10) of X? Please report your answer in 3 decimal places.

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The flow in a river can be modeled as a log-normal distribution. From the data, it was estimated that, the probability that the flow exceeds 821 cfs is 50% and the probability that it exceeds 100 cfs is 90%. Let X denote the flow in cfs in the river. What is the mean of log (to the base 10) of X? Please report your answer in 3 decimal places.

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Step 1

Let X be the flow in a river which follows log normal distribution.

It is provided that, P(X > 821) = 0.50 and P(X > 100) = 0.90.

If X is log normal, then Y = log10(X) is norm...

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