Freshly painted autos are inspected for blemishes. The company has established that the process average that meets their
desired quality level is 8 blemishes per sample during the inspection process. Following are the results for inspecting 20
groups of 10 cars at random during a week-long period.
Sample Blemishes Sample Blemishes
1 8 11 6
2 12 12 8
3 9 13 9
4 11 14 15
5 6 15 7
6 12 16 10
7 10 17 11
8 8 18 12
9 14 19 9
10 7 20 6
Construct a c -chart using Z = 3.00 and determine if the painting process is in control.
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