一道SAT数学题目,要详细解答
3,4,6,7,10,12
The number n is to be added to the list above. If n is an integer, which of the following could be median of the new list of seven numbers?
I. 6
II. 6.5
III. 7
A I only
B II only
C III only
D I and II only
E I, II, and III