Mean hay Average là một trong những chủ đề kiến thức có trong chương trình Cambridge Primary, nhưng là mới với HS lớp 5 Việt Nam. Các câu hỏi trong bài này được trích từ chương trình toán Singapore online nổi tiếng tên là Koobits (tìm hiểu thêm tại http://contuhoc.com/koobits).

CONCEPT:**Average** is also called the** arithmetic** **mean**. It is a calculated "central" value of a set of numbers.

It is easy to calculate: **add up** all the numbers, then **divide by how many** numbers there are. In other words, it is the **sum** divided by the **count**.

**Find the average of the following set of numbers: 34, 39, 19, 70? : ****.**

**The average score Cindy got for her 2 tests is 71. What is the total score for all her tests?**: .

**Find the average of the following set of numbers: 19, 90, 48, 11?**: .

**Find the average of the following set of numbers: 40, 33, 1, 55?**: .

**The average score Hannah got for her 3 tests is 79. What is the total score for all her tests?**: .

**The average score Gina got for her 9 tests is 65. What is the total score for all her tests?:** .

**Find the average of the following set of numbers: 13, 41, 21, 9?:** .

**The average score Linda got for her 5 games is 12. What is the total score for all her games?:**

**The average score Elizabeth got for her 7 games is 15. What is the total score for all her games?:** .

**The average score Lynda got for her 8 games is 23. What is the total score for all her games?:** .