Question: The standard for a process producing tin plate in a continuous strip is 5 defects in the form of pinholes or visual blemishes per 100

The standard for a process producing tin plate in a continuous strip is 5 defects in the form of pinholes or visual blemishes per 100 feet. Based on the following set of 25 observations, giving the number of defects per 100 feet, can it be concluded that the process is in control to this standard?

Inspection number 1 2 3 4 5 6 7 89 10 11

Inspection number 1 2 3 4 5 6 7 89 10 11 12 Number of defects 3 2 2 4 4 4 9. 6 4 1 7 5 5 Inspection number 13 14 15 16 17 18 19 20 21 22 23 24 25 Number of defects 4 6 6 95 2 6 5 11 6 6 8 2

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