 ### Keywords

Hover the mouse over the word to get a definition. Click on the sound symbol to get the pronunciation.

### Plenary

#### Mean

The mean is the total of the numbers divided by how many numbers there are.

To find the mean, add all the numbers together then divide by the number of numbers.
Eg 6 + 3 + 100 + 3 + 13 = 125 ÷ 5 = 25
The mean is 25.
The mean is not always a whole number.

#### Mode

The mode is the number that appears the most.

To find the mode, order the numbers lowest to highest and see which number appears the most often.
Eg 3, 3, 6, 13, 100 = 3
The mode is 3.

#### Median

The median is the middle value.

To find the median, order the numbers and see which one is in the middle of the list.

Eg 3, 3, 6, 13, 100 = 6

The median is 6.

If there are two middle values the median is halfway between them. This might not be a whole number.

#### Range

The range is the difference between the biggest and the smallest number.

To find the range, subtract the lowest number from the biggest number.

Eg 100 – 3 = 97

The range is 97.

Source: BBC Bitesize

#### Lessons

1. Area of rectangles or squares
2. Averages and Range 