The mean of a data set is the sum of the values divided by the total number of values in the set. Let's start by calculating the sum of the given values.
9 + 9 + 14 + 7 + 12 + 8 + 11 + 19 + 15 + 11= 115
There are 10 values in our set, so we have to divide the sum by 10.
Mean: 115/10=11.5
