What is the mean of the data set? 8, 16, 9, 11
A: 9
B: 10
C: 12
D: 11
To find the mean of a data set, you sum up all the values in the data set and then divide by the number of values.
For the given data set of 8, 16, 9, and 11, the sum is 8 + 16 + 9 + 11 = 44.
Then, to find the mean, you divide the sum by the number of values, which is 4 in this case:
44/4 = 11.
Therefore, the mean of the data set is 11.
The correct answer is D: 11.