When you have a whole load of information, it can be quite difficult to deal with.

For example, if I asked whether or not boys were taller than girls, you would have to do something to the data to be able to answer the question.

To do this we take **averages**.

**What is an average?**

An average is just one piece of information that represents all the other information in a data set.

There are** three** types of averages: **mean, median** and **mode**.

Each one has advantages and disadvantages.

In this worksheet, we are going to look at finding the mean.

**How do we find the mean?**

To find the mean, we **add up all the values** in a list and then **divide by the total amount of numbers** in the list.

**Example 1:**

Find the mean of 4, 8, 7, 5, 9, 4, 8, 3

**Step 1: Add up all the numbers**

4 + 8 + 7 + 5 + 9 + 4 + 8 + 3 = 48

**Step 2: Count the numbers in the list**

We have eight numbers in this list.

**Step 3: Divide one by the other**

48 ÷ 8 = 6

**Example 2:**

Find the mean of 21, 23, 20, 27, 25, 24, 25, 30, 21, 22, 28

**Step 1: Add up all the numbers**

21 + 23 + 20 + 27 + 25 + 24 + 25 + 30 + 21 + 22 + 28 = 266

**Step 2: Count the numbers in the list**

We have eleven numbers in this list.

**Step 3: Divide one by the other**

266 ÷ 11 = 24.2

If the answer isn't an integer, give your answer to 1 decimal place unless the question tells you otherwise.

Now let's have a go at some questions.