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What is the mean of the random variable, if the second moment of a Poisson distributed random variable is 2?

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For Poisson R.V Mean = Variance. So, Second Moment = Variance + (Mean)*(Mean) = Mean + Mean2 = 2. On Solving, Mean = 2.
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Random variable means value is not known at the start. Poisson distributed random variable means value of unknown discrete variable follows Poisson's distribution (Type of frequency distribution).
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