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Converting a tolerance from one formula to another is

  • A.exact, since all formulae measure the same quantity
  • B.impossible, since the formulae are unrelated
  • C.unnecessary, since the tolerances are entirely formula independent
  • D.approximate at best, since the acceptance regions differ in shape

Answer: D

A sphere and an ellipsoid cannot be made to coincide in general. Any conversion accepts some batches the original would have rejected and the reverse. A sphere and an ellipsoid cannot coincide. Conversion is approximate at best.

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