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Random Variablesmedium
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A discrete random variable XXX has the probability mass function (PMF) P(X=k)=c⋅kP(X=k) = c \cdot kP(X=k)=c⋅k for k∈{1,2,3}k \in \{1, 2, 3\}k∈{1,2,3}. What is the variance of XXX?