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Random Variablesmedium
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Suppose a discrete random variable XXX has a probability mass function that satisfies P(X=k)=C⋅k2P(X=k) = C \cdot k^2P(X=k)=C⋅k2 for k∈{1,2,3}k \in \{1, 2, 3\}k∈{1,2,3}. What is the variance Var(X)Var(X)Var(X)?