Well, your answer is going to be 12, because add 13 + 13 + 10 and you get 36 on the medium soil, once you do that, you have to divide 36 by 3 and your answer will give you 12.
To find the mean is to add all of the numbers together then divide by the amount of numbers you added together. 13+13+10= 36 then divide 36 by 3 and you get 12
