The following measurements (in picocuries per liter) were recorded by a set of argon gas detectors installed in a research facility: 203.6,   185.9,    199,     178.7             Using these measurements, construct a 95% confidence interval for the mean level of argon 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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