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 9.4kg, and the standard deviation was 0.18kg. How many boxes must the processor sample to be 98% confident that the sample mean does not differ from the population mean by more than 0.07kg ? (Round the intermediate calculation to 2 decimal places. Round the final answer to the nearest whole number.) Sample size