Hello There!
Mean: Average of numbers in a set of data.
STEP 1: Add the numbers in the data set. In this case, you would add
10 + 11 + 12 + 13 + 14 + 14 + 14 + 14 +15
Step 2: Divide the sum by the number of digits you added.
In this case you would divide 117 by 9 and you will get a quotient of 13
ANSWER
THE MEAN OF THE DATA IS 13