1. Mean (Average) Definition: The sum of all values divided by the total number of values in a dataset. How to Calculate: Add all numbers together. 2. Median (Middle Value) Definition: The middle point of a dataset when it is ordered from least to greatest. How to Calculate: Sort the data in ascending order. If the number of values is odd, the median is the middle number. If the number of values is even, the median is the average of the two middle numbers. 3. Mode (Most Common) Definition: The value(s) that appear most frequently in a dataset. How to Calculate: Count how many times each number occurs.