Suppose that one word is selected at random from the sentence the girl put on her beautiful

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Suppose that one word is selected at random from the sentence the girl put on her beautiful red hat. If X denotes the number of letters in the word that is selected, what is the value of Var(X)?
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Probability And Statistics

ISBN: 9780321500465

4th Edition

Authors: Morris H. DeGroot, Mark J. Schervish

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