Question: please solve 2 quality control problems with detailed explanation The Ayan Company produces lamps. Every day inspectors check a sample of 150 finished lamps. As

please solve 2 quality control problems with detailed explanation

The Ayan Company produces lamps. Every day inspectors check a sample of 150 finished lamps. As a result of check some of them are defective others fine to use. Z=3. The below is the data: Sample no. 1 2 3 4 5 6 7 8 9 10 11 12 Defective 1523 1621 13 14 20 25 30 45 22 19 a. What type of control chart should be used here? b. What is the lower control limit (LCL) and upper control limit? c. Is this system under control? Postal service company strives that all sending letters reach destinations. Nevertheless, the results of the study by Kazpost showed that there are some errors indicate on the envelopes. Determine error rate of this study given the following conditions. Each sample consisted of 90 letters. Z=3. Is the process stable (i.e., in control)? Explain. Samples 123456 7 8 9 10 11 12 13 14 Number of errors 43 6747845 9 3 4 5 6

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