## Mean, Median, and Mode

## Formative Assessment

# Summary of the Math: Mean, Median, and Mode

**Read and Discuss**

- Measures of Center
: A measure of center in a set of numerical data, computed by adding the values in a list and then dividing by the number of values in the list.**Mean**: A measure of center in a set of numerical data. The median of a list of values is the value appearing at the center of a sorted version of the list—or the mean of the two central values, if the list contains an even number of values.*Median*: A measure of center that occurs the most often in a data set.**Mode**

- Measures of Spread
: The difference between the extreme (least and greatest) values in a data set.**Range**: A measure of variation in a set of numerical data, computed by adding the distances between each data value and the mean, then dividing by the number of data values.**Mean Absolute Deviation**

: A data value that is far from the rest of the data.**Outlier**

## Hint:

Can you:

- Explain how the different measures of center are affected when data values are added or moved?
- Understand why the median and mean of a data set do not have to be data values, but why the mode, if it exists, will always be a data value?
- Describe or give an example of a data set for which the median is a better measure of what is typical than the mean?