BSL Maths Glossary - average - Definition
Subject level: Foundation
When you take a group of numbers and put them all together and divide them by however many numbers are in the group - that gives you the average. For example, if we've had 7 days of rainfall Monday, Tuesday, Wednesday etc and there has been different amounts each day. You add all these different amounts together and divide by the number of days 7 - and that gives you the average daily rainfall. Here's another example to do with age. We have three people and to get the average age this is what we do. We have Jane who is 12, Jimmy who is 6 and Mike who is 3. If we add all their ages together we get 21. We divide that by 3 because we have 3 people, and the average will be 7.