The following measurements (in picocuries per liter) were recorded by a set of xenon gas detectors installed in a laboratory facility: 476,448.2,431.3 Using these measurements, construct a 99% confidence interval for the mean level of xenon gas present in the facility. Assume the population is approximately normal. Copy Data Step 1 of 4 :   Calculate the sample mean for the given sample data. Round your answer to two decimal places.

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