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Competitive Stats
Q138Section III (Statistics)138 of 145

PGF 12(s+s2)\tfrac12(s+s^2): X is 1 or 2 with equal chance

The probability generating function of a particular random variable is given as P(s)=12(s+s2)P(s)=\tfrac12(s+s^2). What is the variance of the random variable?

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