I do not understand how the answer is "A."
It depends on how many "members" we talk about.
(3+6+9)/3 = 6 (mean) and median 6
(3+6+9+12)/3 = 10 (mean) and 7.5 median
Therefore, I picked "C."
It depends on how many "members" we talk about.
(3+6+9)/3 = 6 (mean) and median 6
(3+6+9+12)/3 = 10 (mean) and 7.5 median
Therefore, I picked "C."