36 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 26.7 pounds. Assume that $\sigma$ = 3.4 pounds.
What is the 95% confidence interval for the true mean weight, $\mu$, of all packages received by the parcel service?
O 25.5 to 27.9 pounds
O 25.7 to 27.7 pounds
O 25.4 to 28 pounds
O 25.6 to 27.8 pounds