Posted by **Joe** on Friday, November 11, 2011 at 2:32am.

A shipping company received an order of 1645 packages. The manager needs to determin the mean weight of the packages. (A) How many randomly selected packages would be need to weight to estimate with a 95% confidence, the mean weight within +/-1.5 pounds if prior studies indicate that the standard dev of all weights is around 8 pounds?

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