An organization that accepts orders via the Web processes it, and has delivery scheduled based on its inventory levels is known to be proficient in its service. Errors in orders received could be due to the wrong shipment of product, incorrect quantity, or not meeting promised delivery date. Given the track record of the organization, Table 8-37 shows the number of error-free orders filled between successive orders that have at least one error. Construct an appropriate control chart and comment on the performance of the organization. Use a level of significance of 0.05.

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TABLE 8-37 Number of Error-Free Orders Between Mistakes Error Orders Error Orders Filled Error Orders Sequence Filled Sequence Sequence Filled 1 150 8 200 15 210 120 9 140 16 240 90 10 165 17 285 140 11 180 18 290 110 12 150 19 320 85 13 155 20 340 160 14 170 -234t 567