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 mass of the boxes, a few were checked. The mean mass was 9.3 kg, the standard deviation 0.19 kg. How many boxes must the processor sample to be 95% confident that the sample mean does not differ from the population mean by more than 0.07 kg?(Round the intermediate calculation to 2 decimal places.Round up any calculated final fractional answer to the nearest whole number.)