If XXX is a discrete random variable where P(X=k)=15P(X=k) = \frac{1}{5}P(X=k)=51 for k∈{10,11,12,13,14}k \in \{ 10, 11, 12, 13, 14 \}k∈{10,11,12,13,14}, what is the median of XXX?
11
12
13
12.5