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To find the necessary sample size to achieve the given level of accuracy of prediction.

A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test the weight of the boxes, a few were checked. The mean weight was 20.4 pounds, the standard deviation 0.5 pounds. How many boxes must the processor sample to be 95 percent confident that sample mean does not differ from population mean by more than 0.2 pounds?

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