We decide to flip a fair coin consecutively until we flip a head or flip the coin 10 times, whichever comes first. Note that if we flip a head in less than 10 attempts, we stop immediately. Otherwise, we flip the coin ten times. What is the expected number of times we will flip a head?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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We decide to flip a fair coin consecutively until we flip a head or flip the
coin 10 times, whichever comes first. Note that if we flip a head in less
than 10 attempts, we stop immediately. Otherwise, we flip the coin ten
times. What is the expected number of times we will flip a head?

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