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State whether the following is true or false.
Aiming exactly at the specified minimum strength is sound practice for a cement works.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: D

Half the production would then fall below it, since results scatter about the mean. The target is set above the minimum by a margin determined by the standard deviation of the process. Reducing variability is as valuable as raising the mean.

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