Let X be a random variable that is equal to the number of heads in two flips

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Let X be a random variable that is equal to the number of heads in two flips of a fair coin. What is E [X2]? What is E2 [X]?

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Introduction to Algorithms

ISBN: 978-0262033848

3rd edition

Authors: Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest

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