Programmers and Teachers:
Lesson on the Mean
What is the Mean?
The mean is the average of a set of numbers. It is a useful number in statistical analysis because it can be used to determine the average value of a data set.
The mean of a set of numbers is found in two simple steps:
1.) Add up all the numbers. We now have the sum of the numbers.
2.) Divide the sum by the amount of numbers in the set.
For example, let’s find the mean of the set of numbers (4, 7, 3, 2, 9).
1.) Adding the numbers up, we get 4 + 7 + 3 + 2 + 9 = 25.
2.) Dividing the sum by the amount of numbers, we get 25⁄5 = 5. The mean is 5.
How the Calculator Works
Next, it sums the list of numbers. That sum is then divided by the amount of numbers, resulting in the mean. The raw mean value is rounded to the 4th decimal place and displayed on this page as the solution.