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a) The flow in a river can be modeled as a log-normal distribution. From the data,...

a) 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 862 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.

b) 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 1,150 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 standard deviation of log (to the base 10) of X? Please report your answer in 3 decimal places.

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