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In order to determine the average weight of large post-it parcels at a post office, a sample of 31 parcels was weighed. The average weight

In order to determine the average weight of large post-it parcels at a post office, a sample of 31 parcels was weighed. The average weight was found to be7.8 kg with a standard deviation of 5.2 kg. Determine a 90% confidence interval for the mean. State thelower limit only (in kg) correct totwo decimal places.

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