The probability mass function for a discrete random variable X is defined as ((1+0)-(x) 0; x = 0,1,2,3,..., η (x) = {(1+0) (2) *; fx(x) 0; e.w. where 0 > 0. Show that it is probability mass function. Find its mean and variance.

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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The probability mass function for a discrete random variable X is

defined as ((1+0)-(x) 0; x = 0,1,2,3,..., η (x) = {(1+0) (2) *;

fx(x)

0;

e.w.

where 0 > 0. Show that it is probability mass function. Find its mean and variance.

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