Suppose that the time in between customers at a store are independent Exponential random variables, with an

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Suppose that the time in between customers at a store are independent Exponential random variables, with an average of 2 minutes between consecutive customers. Let X be the time until the 3rd customer arrives.
a. Find E(X).
b. Find Var(X).
c. Find the density of X
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Introduction to Probability

ISBN: 978-0716771098

1st edition

Authors: Mark Daniel Ward, Ellen Gundlach

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