Tolerance and Distribution

In this model, if a product or process is in tolerance, the measurement value can be found somewhere inside the interval bounded by the upper and lower tolerance limits. It absolutely cannot be outside those limits.

The rectangular distribution offers no information about what the measurement value might be. It has an equal chance of being found anywhere between the limits, and no chance of being found outside.

The tolerance statement is an absolute - it leaves no room for ambiguity. The value is somewhere inside the interval - period.

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