Enter the mean and the coefficient of variation (%) into the QC Range Calculator. The calculator will evaluate the QC Range. 

QC Range Formula

The following two example problems outline the steps and information needed to calculate the QC Range.

QCR = M +/- 2*CVh / 100 * M

Variables:

  • QCR is the QC Range ( )
  • M is the mean 
  • CVh is the coefficient of variation (%) 

How to Calculate QC Range?

The following steps outline how to calculate the QC Range.

  1. First, determine the mean. 
  2. Next, determine the coefficient of variation (%). 
  3. Next, gather the formula from above = QCR = M +/- 2*CVh / 100 * M.
  4. Finally, calculate the QC Range.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

mean = 30

coefficient of variation (%) = 2.5

QCR = M +/- 2*CVh / 100 * M = ?