Eight people enter an elevator in the parking garage below a building. Each person chooses her exit

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Eight people enter an elevator in the parking garage below a building. Each person chooses her exit independently of the other people. The building has floors 1 through 10. What is the expected number of stops that the elevator makes?
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Introduction to Probability

ISBN: 978-0716771098

1st edition

Authors: Mark Daniel Ward, Ellen Gundlach

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