Question: 39 packages are randomly selected from packages received by a parcel service. The sample mean weight is 15.3 pounds. From previous samples we know

39 packages are randomly selected from packages received by a parcel service. The sample mean weight is 15.3 pounds. From previous samples we know the population standard deviation 1.9 pounds. Construct at 95% confidence interval for the true mean weight of all packages received by the parcel service.

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