CeeCee recorded the number of necklaces for sale at 10 different locations and then arranged the numbers from smallest to largest. The numbers of necklaces for sale at the locations were 4, 4, 4, 5, 8, 9, 9, 9, 9, and 9. The mean number of necklaces for sale at the locations was 7.
What is the mean absolute deviation?
A. 0
B. 2
C. 2.2
D. 4.4