arithmetic mean 
noun
The average of a set of numerical values, as calculated by adding them together and dividing by the number of terms in the set.It is easy to see that the medial and the binomial are closely related to the geometric mean and the arithmetic mean respectively....
- Geometric means give relatively greater weight to smaller values than arithmetic means and are therefore a conservative measure of average sample size.
- The average may either be calculated using an arithmetic mean or a geometric mean.
- step change
- stepchild
- step-cut
- stepdad
- stepdaughter
- step down
- stepfamily
- stepfather
- Stepford
- lower orders
- lower (or raise or lift) the bar
- lower plants
- lower-ranking
- lower regions
- Lower Saxony
- lower school
- lower second
- lower sixth
- lower the boom on
- lower the tone
- lower working class
- lower world
- lowest common denominator
- lowest common multiple
- Lowestoft