Obtain the mean annual flow for each year of the period of record for a gage included in the National Water Information System accessible through the USGS web site, Choose a gage with at least 40 years of record. The USGS determines mean annual flows by averaging the daily flows recorded throughout the year. Assuming that mean annual flows are modeled by the normal probability distribution, estimate them mean annual flows that have exccedance frequencies of (a) 50 percent, (b) 20 percent, and (c) 10 percent.
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