You need to know the definitions of Mean, median, and mode and know they are three kinds of "averages".
Mean is where you add up all the numbers and then divide by the number of numbers.
Median is the "middle" value in the list of numbers. The numbers have to be listed in numerical order from smallest to largest, so you rewrite your list this way so you can find the median.
Mode is the value that occurs most often. If no number is repeated, then there is no mode for the list.
Range is the largest number subtract the smallest number.
