A production manager at a Contour Manufacturing plant has inspected the number of defective plastic molds in 5 random samples of 20 observations each. Following are the number of defective molds found in each sample: Sample N Number of observations Number of defections 1 1 20 2 2 20 3 2 20 4 1 20 5 0 20      a) Construct a 3-sigma control chart (P-chart) with this information.

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4: A production manager at a Contour Manufacturing plant has inspected the number of defective plastic molds in 5 random samples of 20 observations each. Following are the number of defective molds found in each sample:

Sample N Number of observations Number of defections 1 1 20 2 2 20 3 2 20 4 1 20 5 0 20

     a) Construct a 3-sigma control chart (P-chart) with this information.

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