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The time between successive requests to a server are independent random variables, each exponentially distributed with mean 1. Let Tn denote the time of the

The time between successive requests to a server are independent random variables, each exponentially distributed with mean 1. Let Tn denote the time of the nth request. What are the mean and variance of Tn? 2,n n,n^2 2n,4n n,n none

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