Question: Problem 1 (10 points). The operator of automated sorting machines in a post office must read the zip code on letters and divert the letters

Problem 1 (10 points). The operator of automated

Problem 1 (10 points). The operator of automated sorting machines in a post office must read the zip code on letters and divert the letters to the proper carrier routes. Over a month's time, 12 samples of 100 letters were chosen and the proportions of errors were recorded as: 04, 02, 03, 02, 03, 03, 02, 01, 04, 05, 03 and .04. a. Calculate p-bar (CL) and the standard deviation of the process. (4) b. Calculate the control limits for a p control chart. (3) c. A sample of 100 letters has just been taken, and 9 errors were found. Is the process still in control? (3)

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