A discrete variable XXX has PMF P(X=k)=1/4P(X=k) = 1/4P(X=k)=1/4 for k∈{−2,−1,1,2}k \in \{-2, -1, 1, 2\}k∈{−2,−1,1,2}. What is the kurtosis?
1.25
2.5
1.5
2