Let X be a random variable taking values in the positive integers, with probability mass function of the form: pX (k) = 2/3^(−k) Does E(X) and V (X) exist for this pmf? and how should I calculate them? or why they are not exist?
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Originally Posted by sweetadam Let X be a random variable taking values in the positive integers, with probability mass function of the form: pX (k) = 2/3^(−k) Does E(X) and V (X) exist for this pmf? and how should I calculate them? or why they are not exist? Does converge? Does converge?
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