Question: plastic strips that are used in a sensitive electronic device are manufactured to a maximum specification of 305.70 mm and a minimum of 304.55 mm

plastic strips that are used in a sensitive electronic device are manufactured to a maximum specification of 305.70 mm and a minimum of 304.55 mm . If the strips are less than the minimum specification, they are scraped , if greater than the maximum specification they are reworked. the part dimensions are normally distributed with a mean of 305.20 mm and process standard deviation of 0.25 mm

1: estimate the percentage of conforming items that will be produced

2: what proportion of the product is scrap

3: what percentage is reworked

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