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Suppose 30 control limits are constructed for the average temperature in a furnace. Samples of size 4 were selected with the average temperature being 5000

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Suppose 30 control limits are constructed for the average temperature in a furnace. Samples of size 4 were selected with the average temperature being 5000 C and a standard deviation of 50 C, lc. Approximately how many samples, on average, will be analyzed before detecting a change when Rules 2 and 3 are used simultaneously

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