5.16. The following were the number of breakdowns in insulation in 5000-ft lengths of rubber covered wire: 0, 1, 1, 0, 2, 1, 3, 4, 5, 3, 0, 1, l, 1, 2, 4, 0, 1, 1, 0. What were the central line and control limits for the number of breakdowns? What would be the central line and limits for the average number of breakdowns per length for samples of five lengths?