Question: An X-bar R chart was prepared for an operation using twenty samples with 5 pieces in each sample. X-bar-bar was found to be 33.6and R=bar

An X-bar R chart was prepared for an operation using twenty samples with 5 pieces in each sample. X-bar-bar was found to be 33.6and R=bar was 6.2. During production a sample of 5 was taken and the pieces measured 36, 43, 37, 25, and 38. At the time this sample was taken: Circle the correct answer:

Both average and range were within control limits
Neither average nor range were within control limits
Only the average was outside control limits
Only the range was outside control limits

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