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.

#### Mean

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

#### Median

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

#### Mode

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.

#### Range

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

Triangles / Pythagoras