Anthropometrics, Ergonomics and Standard Distribution Curve

Anthropometrics
Definition - anthropometry, especially as it relates to the design of furniture and machinery.

 

Ergonomics
Definition - the study of people's efficiency in their working environment.
Standard distribution curve 

There are many cases where the data tends to be around a central value with no bias left or right, and it gets close to a "Normal Distribution" like this:

A Normal Distribution

The "Bell Curve" is a Normal Distribution. 

And the yellow histogram shows some data that 

follows it closely, but not perfectly (which is usual).