I need help on problem 7 and 9. Thank you A production manager at a Contour Manu

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I need help on problem 7 and 9. Thank you

A production manager at a Contour Manufacturing plant has inspected the number of defective plastic molds in five random samples of 20 observations each. Following are the number of defective molds found in each sample: Sample Number of Defects Number of Observations in Sample Construct a 3-sigma control chart (z = 3) with this information. (If the lower control limit is negative, round the LCL to zero and all other answers to 2 decimal places, e.g. 15.25.) U-leam University uses a c-chart to monitor student complaints per week. Complaints have been recorded over the past ten weeks. Develop 3-sigma control limits using the following data:

Explanation / Answer

Dear Student, only one question is allowed at a time.

7)

Mean or CL = 11 / 5 = 2.20

Standard deviation (SD) = Sqrt(1.36) = 1.17

UCL = CL or Mean + 3 x SD = 2.20 + 3 x 1.17 = 5.71

LCL = CL or Mean - 3 x SD = 2.20 - 3 x 1.17 = Negative that is 0.

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