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10 cards from this deck
To ensure products meet standards without testing all items.
Sum the measurements and divide by the number of items.
It shows how sample means perform over time.
The target mean is represented by the symbol μμμ (mu).
Approximately 95% of sample means fall within these limits.
Stop the machine, check for issues, and reset the process.
They are set at ±2σ±2σ±2σ from the target mean μμμ.
Take another sample to check for random variation.
It suggests the result is unlikely due to chance.
It represents the average measurement of the sample.
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