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A proof test destroys 3 per cent of a batch of 2,000 components. How many survive the test?

  • A.1,997
  • B.2,000
  • C.1,940
  • D.60

Answer: C

Three per cent of 2,000 is 60, leaving 1,940 survivors. Whether that loss is acceptable depends entirely on the consequences of a failure in service. For a critical component a three per cent loss may be cheap insurance.

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