Lean Manufacturing and Six Sigma Definitions

Glossary terms, history, people and definitions about Lean and Six Sigma


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X-bar is the written out version of the sample average calculation, which is denoted as the symbol below:

The calculation takes the sum of the numbers in the sample, and divides by the sample size.

This is typically used when it’s not easy to type out the x with a bar over the top of it, thus X-bar or Xbar.


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