The mean of a data set is equal to the sum of the set of numbers divided by how many numbers are in the set.
Let's look at an example.
6, 8, 9, 14, 23
To find the mean of the data set shown above,
start by adding the numbers.
Adding the numbers, we get 60.
60 will be divided by the number of numbers in the set, which is 5.
So, 60 divided by 5 is 12.
So the mean of this data set is 12.