Question: 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

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.

- 6 7 3 8 5 7 5 5 5 5 8 3 6 44 40 4 4 4 4 4 4 4 4 4 2 ct e 4 4 4 33537051232519 Wel 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 12345678901234567

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a The centerline for the c chart is the average number of defects or 5 defective out of 500 screens ... View full answer

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