How to Find the Mean
The mean is just the average of the numbers.
It is easy to calculate: Just 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?
3, 10, 5
Add the numbers: 3 + 10 + 5 = 18
Divide by how many numbers (ie we added 3 numbers): 18 ÷
3 = 6
The Mean is 6
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 equal to 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) = 32 = 1. So, 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 37+5+132 = 12
There are 5 numbers.
The mean is equal to 12 ÷ 5 = 2.4
The mean of the above numbers is 2.4
