Mean - Add up all the values then you divide by how many values there are.
Median - The middle number in a set of ordered values, might be the mean of 2 middle values.
Mode - The value that shows up the most.
Range - Positive differences between the largest and smallest values.
Outlier - Values that are too big or too small compared to the other values.
Make sure you know these definitions! They will be on the exam!