Answer:
Adding all the numbers together and dividing by the number of numbers
Example:
1, 3, 5, 6, 6, 6, 8, 8, 35, 46
Adding them together results in 124
124 divded by the number of numbers is 124 / 10 = 12.4
So the mean / median in this example is 12.4
(I think, hopefully this helps and I hope you have a nice day!)