Measures of center
1. this is the sum of all the results included in the sample divided by the number of observations. it is the same as the average.

2. this is the most frequently occurring element in a set

3. this is the difference between the max and the min value in a data set

4. commonly used measures of statistics that describes the center or frequency of a distribution: mean, median, mode

5. this is a value which is much greater than, or much less than, the other values. it is important because it can affect your measures of central tendency greatly

6. the middle term in an ordered set of data. if the data set has an even number of terms, this is the average of the two middle terms