What does it mean when they say what is the mean of a data set?

the mean of a set is the average of the numbers in that set. How you get the mean is you add up all the numbers then you divide by how many numbers are in the set.

Step-by-step explanation:

example is 1,2,3,4,5,6,7

the mean of this set is 4

Below.

Step-by-step explanation:

The mean is the average of a set of numbers:

Mean = sum of the values / number of values.

For example the mean of 2 6 8 12 is

(2 + 6 + 8 + 12) / 4

= 28/4

= 7.