We use the following basic statistical measures to gain deeper insights into how our process is performing.

**Mean: **The average of all values of a data set.

**Median:** The middle value of a data set when the values are arranged in either ascending or descending order

**Mode:** The mode common value of a data set.**Range: **The span of numbers in the entire range of the set.

Standard Deviation – see article there.

Central Tendency – see article there.

Also related, Basic Probability