Question

The following measurements (in picocuries per liter) were recorded by a set of radon gas detectors installed in a laboratory facility: 684,684.4,677.1,680.6,671.5,657.1 Using these measurements, construct a 80% confidence interval for the mean level of radon gas present in the facility. Assume the population is approximately normal. Step 1 of 4 : Calculate the sample mean for the given sample data. Round your answer to two decimal places.

Answer 1

We get a sample mean of 675.78.

Explanation:

To calculate the sample mean, we need to sum up all the measurements and divide by the total number of measurements:

Sample mean = (684 + 684.4 + 677.1 + 680.6 + 671.5 + 657.1) / 6 Sample mean = 4054.7 / 6 Sample mean = 675.78

Rounding this to two decimal places, we get a sample mean of 675.78.