Samples of 100 checks each were taken at a bank from an encoding machine (which records the amount of a check) over a five-day period. Number of defectives for each sample group is shown below. If the bank were to use the average proportion defective from these five samples as the central line for a process control chart, what would be the central line(nbar)? (Note: Need to find the p values first). Use three decimal places in your calculations. Show vour solution for p values and p-bar