**The mean is the average of the 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.
**

**
**

**
****Example 1: What is the Mean of these numbers? **

**6, 11, 7
**

**
**

**Add the numbers: 6 + 11 + 7 = 24
**

**Divide by how many numbers (there are 3 numbers): 24 / 3 = 8
**

**The Mean is 8
**

**Why Does This Work?
**

**It is because 6, 11 and 7 added together is the same as 3 lots of 8:
**

**
**

**average
**

**
**

**It is like you are "flattening out" the numbers
**

**
**

**Example 2: Look at these numbers:
**

**3, 7, 5, 13, 20, 23, 39, 23, 40, 23, 14, 12, 56, 23, 29
**

**
**

**The sum of these numbers is 330
**

**
**

**There are fifteen numbers.
**

**
**

**The mean is equal to 330 / 15 = 22
**

**
**

**The mean of the above numbers is 22
**

**Negative Numbers
**

**How do you handle negative numbers? Adding a negative number is the same as subtracting the number (without the negative). For example 3 + (−2) = 3−2 = 1.
**

**
**

**Knowing this, let us try an example:
**

**
**

**Example 3: Find the mean of these numbers:
**

**3, −7, 5, 13, −2
**

**
**

**The sum of these numbers is 3 − 7 + 5 + 13 − 2 = 12
**

**There are 5 numbers.
**

**The mean is equal to 12 ÷ 5 = 2.4
**

**The mean of the above numbers is 2.4
**

**Here is how to do it one line:
**

**
**

**Mean = 3 − 7 + 5 + 13 − 25 = 125 = 2.4
**