Hello!
The value that is in the middle of the data set will be the mean. (So, there will be three numbers on the left of it, and three to the right).
Let's say the numbers are 7, 9, 3, 6, 2, 1, 5 (Just as an example)
Because the amount of numbers in this data set is seven, it is an odd number. This means to find the median, we simply have to look at the number in the middle of the set. (In this case, that would be six).