Automobiles are randomly selected for a close examination for fit-and-finish defects, including such items as dirt specks in the paint and panels that are not properly aligned. Based on data collected for the following vehicles that were so inspected, construct a 3-sigma c-chart, then reach a conclusion regarding whether the process is in control.

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Vehicle c = Number Number of Defects Vehicle Number c = Number of Defects 1234567 4 11 7 12 6 10 4 13 5 9 9 866 14 10 15 7 16 6 7 17 8 8 9 10 615 18 5 7 29 19 7 20 11