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Random Variableseasy
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If a discrete random variable ZZZ has possible values {−1,0,1}\{-1, 0, 1\}{−1,0,1} with probabilities P(Z=−1)=0.1P(Z=-1)=0.1P(Z=−1)=0.1, P(Z=0)=0.8P(Z=0)=0.8P(Z=0)=0.8, and P(Z=1)=0.1P(Z=1)=0.1P(Z=1)=0.1, what is the expected value E[Z2]E[Z^2]E[Z2]?