You are a bookseller with a case of 35 picture books: 5 copies of Cat Toys for Emus1 (45 pages long), 10 copies of Emus at War2 (350 pages long), and 20 copies of Emus on Ice3 (100 pages long). (a) What is E[X] if X is the number of pages in a randomly chosen book? (b) If the cost per page of each of these books is $0.13, what is the expected cost of that randomly chosen book?

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You are a bookseller with a case of 35 picture books: 5 copies of Cat Toys for Emus1 (45 pages long), 10 copies of Emus at War2 (350 pages long), and 20 copies of Emus on Ice3 (100 pages long).
(a) What is E[X] if X is the number of pages in a randomly chosen book?
(b) If the cost per page of each of these books is $0.13, what is the expected cost of that
randomly chosen book?

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