Question 43749
Hello!
In order to find the mean of a set of numbers, you simply need to sum all the numbers, and then divide that sum by the size of the set (the number of values in the set).


Let's start with the sum:

{{{13+15+18+18+18+19+22+26+28+33 = 210}}}

Now, how many numbers are there in the set? If you count them, you'll see that you have 10 numbers. Therefore, the mean of this set is:

{{{210/10 = 21}}}

Therefore, the mean is 21.


I hope this helps!
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