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Suppose that 40% of a large number of students who have to buy a textbook for a particular course want a new copy, whereas the other 60% want a used copy. Consider randomly selecting 25 purchasers. What is the distribution of the number of students who want new books? What are the mean value and standard deviation of the number of students who want new books? What is the probability that the number of students who want new books is more than two standard deviations above the mean? The book store has 15 used book and 15 new books. If the 25 purchasers come in one by one to purchase this textbook, what is the probability that all 25 get the type of book they want from the current.

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