Consider a discrete random variable XXX with P(X=k)=k230P(X=k) = \frac{k^2}{30}P(X=k)=30k2 for k∈{1,2,3,4}k \in \{1, 2, 3, 4\}k∈{1,2,3,4}. What is E[X]E[X]E[X]?
3.3
3.5
3.2
3.0