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Sea Level Fluctuations

According to data from NOAA (National Oceanographic and Atmospheric Administration), monthly sea level fluctuation taken from the San Francisco Bay Area followed a 95%95\% confidence interval (1.75,2.13)(1.75,2.13) mm/year. If the standard deviation of the fluctuation is 3.64783.6478 mm/year, how many years did the data cover?

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