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A discrete distribution defined on the non-negative integers that has the property that the mean is equal to the variance.
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Relationship between Poisson count and Exponential inter-arrival times [duplicate]
This picture represents transactions. $T_1$ is the time of the first transaction, $T_2$ time of second, $T_x$ time of the $x$th transaction
$t$ is the observation period, $X(t)$ denotes the number of …