In data analysis, there are 3 types of ‘Average’; which are Mean, Median and Mode, and one which measures the ‘Spread’, which is the Range. The below examples explain how to obtain these measurements.


To obtain: Add up all the numbers then divide by how many numbers there are.


To obtain: First, order the number in ascending order then count the number of items in the set.

  • If you have an odd number then the Median is the number in the middle of the set
  • If you have an even number then the Median is the number that is halfway between the 2 middle numbers in the set


The Mode is the number, or term in the list, that occurs the most. There can be 3 possibilities:

  • No Mode: In this case there is no number (or term) that occurs more than once.
  • One Mode: There is only one number (or one term) that occurs the most.
  • More that one Mode: This is when we have numbers (or terms) that occurs equally more than once.

Note: Our list does not have to be a numerical list because the Mode is about the most occuring term in the list.


The Range specifies the spread of the data. It is obtained by subtracting the smallest number from the biggest.

Triangles / Pythagoras