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Why in that problem are there 11 numbers represented but only 10 counted?

Mean Example Problems

Example 1

Find the mean of the set of numbers below

Solution

The first step is to count how many numbers there are in the set, which we shall call n

The next step is to add up all the numbers in the set

The last step is to find the actual mean by dividing the sum by n

Comments

Should there be a set of numbers in this problem?

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Donald S. | Retired certified teacher, science, math, tech, engineering...Retired certified teacher, science, math...
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We can not see your original problem, however I created variations of problems and can conclude in a possible answer. 
 
Using the above stated steps we would count all of the numbers individually, even if; it was a zero, a negative number, and even duplicated numbers, to get a total of "n".  So, if you started with 11 numbers, regardless of what they were, you would count 11 = n.  Verify that the example problem was done this way, and maybe you will come to the conclusion that you discovered an error in the example's solution.