To calculate the mean (average) of the numbers you provided, we need to first find the total sum of the years and the number of teachers involved.
The years of teaching you listed are:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Now, let's calculate the sum:
\[ 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 \]
Next, we need to count the total number of values (years of teaching). In this case, there are 11 numbers.
Now we can calculate the mean:
\[ \text{Mean} = \frac{\text{Total sum}}{\text{Number of teachers}} = \frac{55}{11} = 5 \]
Therefore, the mean number of years of teaching is 5.