Dan, Dominic, and Doug are waiting together in the living room for their girlfriends, Sally. Shellie, and

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Dan, Dominic, and Doug are waiting together in the living room for their girlfriends, Sally. Shellie, and Susanne, to call their waiting times (in hours) are independent Exponential random variables, with parameters 2.1, 3.7, and 5.5, respectively. What is the probability that the phone will ring (i.e., the first call will arrive) within the next 30 minutes (i.e., within the next 1/2 an hour)?
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Introduction to Probability

ISBN: 978-0716771098

1st edition

Authors: Mark Daniel Ward, Ellen Gundlach

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