For the past six weeks, Heather has purchased a small container of apples at the local market. Each week, she recorded the number of apples in each container and compiled her results in a list.
(11, 9, 12, 12, 10, 7)
What is the mean absolute deviation of this data set?
A. 1.5
B. 9
C. 10.2
D. 10.5
