Problem
Noise levels at 3 construction sites were measured in decibels yielding the following data: \[ 153,163,181 \] Construct the $95 \%$ confidence interval for the mean noise level at such locations. Assume the population is approximately normal. Step 1 of 4: Calculate the sample mean for the given sample data. Round your answer to one decimal place. Answer How to enter your answer (opens in new window)
Solution
Step 1 ：Add up all the values: \(153 + 163 + 181 = 497\)
Step 2 ：Divide by the number of values: \(\frac{497}{3} = 165.67\)
Step 3 ：\(\boxed{165.7}\) is the sample mean, rounded to one decimal place.
