Faulty pixels. In LCD screens, every attempt is made to make sure that all pixels illuminate when they receive a signal, but it is impossible to ensure that every pixel in a large screen will actually work. A screen is determined to be defective if more than 2 pixels fail to light. Every week 500 screens are randomly selected and a quality control team member counts the number of defective screens. Out of 500 screens, management would like an average of no more than 5 defective screens. The results for the last 50 weeks are shown in the following table.

a) Create a c chart.

b) Is the number of defective screens out of control?
Comment.

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Defective Defective Defective Week Screens Week Screens Week Screens 1234 56789 5 18 4 35 6 6 19 4 36 6 4 20 4 37 7 5 21 3 38 3 1 7 1 4 25 3 10 4 11 4 12 6 13 4 14 3 15 4 16 1 22222222222 3 39 8 23 5 40 5 24 3 41 7 7 42 5 26 10 43 5 27 5 44 5 28 11 45 5 29 2 46 8 30 3 47 3 2 48 6 32 5 33 11 50 49 4 50 4 17 4 34 9