6 terms

Statistics (GRE Math Formula Book)

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Mean
For a set of n numbers: total sum / n
Median
Middlemost value when numbers are arranged in ascending order; for an even amount of numbers, take the average of the middle two
Mode
The number that occurs most frequently
Weighted Average
(proportion) x (group A average) + (proportion) x (group B average) + ...
Standard Deviation
SD = Sqrt((a-m)^2 + (b-m)^2 +(c-m0^2) +...)/n)) ;where a, b, and c are a set of numbers and m is the mean.

The standard deviation represents the average distance the data values are away from the mean.
Variance
value inside the square root of the standard deviation
Variance=SD^2
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