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(a) The weight of boxes of oat flakes within a large production lot is sampled each hour. To set control limits that include 99.73% of the sample means, the following results are obtained. Also, the population standard deviation (o) is 10 grams. i) Calculate the upper and lower control limits; (20 marks) (20 marks) (10 marks) (ii) Plot the average chart; ) Comment on the process Weight of sample Hour Weight of sample e of 6 boxes Hour e of 6 boxes 161 168 155 165 165 6 7 8 152 164 163 148 142 4. 10 Note: Control limits x 30, where σχ

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